Analysis and Evaluation of the Spatial Structure of Cittaslow Towns on the Example of Selected Regions in Central Italy and North-Eastern Poland

Cittaslow International promotes harmonious development of small towns based on sustainable relationships between economic growth, protection of local traditions, cultural heritage and the environment, and an improvement in the quality of local life. The aim of this study was to analyze and evaluate the differences and similarities in the spatial structure of Cittaslow towns in the Italian regions of Tuscany and Umbria and the Polish region of Warmia and Mazury. The study examined historical towns which are situated in different parts of Europe and have evolved in different cultural and natural environments. The presented research attempts to determine whether the spatial structure of historical towns established in different European regions promotes the dissemination of the Cittaslow philosophy and the adoption of sustainable development principles. The urban design, architectural features and the composition of urban and architectural factors which are largely responsible for perceptions of multi-dimensional space were evaluated. These goals were achieved with the use of a self-designed research method which supported a subjective evaluation of spatial structure defined by historical urban planning and architectural solutions. The study demonstrated that Medieval urban layouts can be successfully incorporated into the modern urban fabric to promote sustainable development and slow living.


Introduction
The objective of the Cittaslow International network of small towns is to promote harmonious development and slow living. This philosophy offers an alternative to globalization and the fast pace of life in large cities [1][2][3]. Cittaslow towns implement sustainable development policies by creating a healthy balance between economic growth, protection of local traditions, cultural heritage and the environment, and improving the quality of local life [4][5][6]. The members of the Cittaslow network promote local and specific values and products, and they initiate active measures to protect the natural environment and the historical urban fabric. These policies build a sense of solidarity among local community members who feel responsible for their place of residence, including its past and future [7,8]. The unique spatial structure of historical towns plays an important role in building harmonious relationships and adapting these towns to contemporary needs and aspirations [9,10].
Small towns are human settlements that occupy a relatively limited area and organize their living space in a similar manner regardless of their location. The scale of urban development, small population, absence of industry and low levels of technical infrastructure relative to large cities contribute to sustainable development and reluctance towards modern trends that rely heavily on globalization and a fast pace of life.
Considerable research has been dedicated to the development and future outlook of urban expansion. Zambon et al. [11] performed a quantitative analysis of urban plans to predict future urban growth patterns. The authors relied on an extensive database of social and economic indicators to examine the consequences of urban expansion in the Spanish region of Catalonia which was divided into local zones for the needs of the study. They found that urbanization had contributed little to the sustainable development of towns in recent decades. The authors concluded that future urban development in Catalonia will not follow a polycentric model, but will fuel the growth of small and medium-sized towns. The historical center of Santiago de Chile was modernized based its architectural and urban heritage. The elements of the city's original urban fabric were recreated and used to propose a new urban development concept. This approach was adopted to bridge the gap between modern requirements and the city's colonial and republican past [12]. In Senigallia, Italy, the open-design approach was implemented to regenerate the town's historical urban heritage through participatory design [13]. The town's historical district was redesigned with the use of Multicriteria Decision Analysis (MCDA). Historical districts pose a challenge for urban designers who have to reconcile conservation with modern welfare and safety standards. The MCDA approach was validated experimentally in Biella, Italy [14].
The aim of this study was to analyze the differences and similarities in the spatial structure of small towns belonging to the Cittaslow network. The evaluated towns are located in the Italian regions of Tuscany and Umbria and the Region of Warmia and Mazury in north-eastern Poland. Based on the aim of the study, the authors made an attempt to answer the following research questions: 1.
Does the spatial structure of towns which are situated in different parts of Europe and have evolved under different historical, cultural and environmental conditions promote the achievement of Cittaslow goals in equal measure? 2.
Which components of historical spatial structures (that developed under different functional conditions) foster the implementation of sustainable development policies and the slow living philosophy?

Cittaslow International
Current trends in urban and economic development favor measures that strengthen the growth potential of mainly large urban agglomerations. Rapid globalization has contributed to a faster pace of life. The citizens of highly developed countries show a growing appreciation for the slower approach to everyday life in smaller settlement units [15,16]. In small and medium-sized towns, most businesses operate only on the local market. These towns often collaborate and join various organizations to expand their economic potential. One of such organizations is the Cittaslow Movement, an international network of cities that was founded in 1999 to endorse the Slow City concept. Towns can apply for Cittaslow membership if their population does not exceed 50,000, and if they support and implement the organization's goals [17]. Candidates are evaluated in seven areas: energy and environmental policy, infrastructure policies, quality of urban life policies, agricultural, tourism and artisan policies, policies for hospitality, awareness and training, social cohesion and partnerships, based on 72 detailed criteria. Towns that meet at least 51% of these requirements are eligible for membership. They are re-evaluated (re-certified) based on the same criteria after five years [18].
The overreaching goal of the Cittaslow movement is to improve the quality of life, promote economic growth, protect the natural environment and cultural heritage, promote regional products, crafts, traditions and customs [19]. The movement advocates a slower pace of life as an alternative to the hustle and bustle of large cities and metropolises. The organization does not oppose technological progress, and its members are local economic hubs that place a high value on preserving their unique character [8]. Cittaslow members promote their towns as places with a high quality of life in the proximity of nature, highquality products and strong local communities [20].
The goals of the Cittaslow movement coincide with the principles of sustainable development, with the main emphasis on increasing local incomes, improving local safety, fostering a friendly social environment, improving the quality of the natural environment, enhancing spatial order and the functionality of urban spatial structures [21]. Sustainable cities are characterized by a cohesive relationship between the urban and the natural environment. Social and environmental movements play an important role, and they focus on preserving the city's unique character, restoring historical architecture, promoting local products and cuisine. In cities that are popular tourist destinations, considerable emphasis is placed on the promotion of local hospitality traditions [16,22]. Globalization increases the risk of cultural uniformity by destroying local values. The Cittaslow concept stimulates local growth as the core element of sustainable development. Member towns strive to preserve their identity and protect local values, both in the Cittaslow network and in the global context [7]. Sustainable development encompasses the environmental, social and economic aspects of urban growth. Community participation plays an important role in decision-making, and participatory processes further the sustainable development of all Cittaslow members at the local level. Cittaslow towns initiate a variety of events and projects with the involvement of the local authorities and residents, which is why the Cittaslow network is also regarded as a social movement and a local governance model [23].
The spatial layout and the potential of small historical towns are well aligned with the main tenets of the Cittaslow movement which are strongly rooted in sustainability [24]. Towns that boast the snail logo strive to improve the quality of local life and cultivate the culture of good living. The small size of urban structures, the cozy ambience of public spaces (squares, streets, parks) and small population encourage the preservation of local traditions and the search for harmony between a slow-paced life and sustainable development [25,26]. Historical towns are characterized by strong place identity, which promotes social integration and fosters a sense of attachment to one's home [27,28]. In towns with historical urban design and architecture, the residents are more likely to identify with and feel responsible for their place of residence than large city dwellers. These factors contribute to the search for novel urban planning solutions that are consistent with the Cittaslow philosophy of a slow life and eco-friendly development [27,29]. Historical structures in small towns well serve the above goals.
The philosophy and ideological assumptions of Cittaslow movement also fit in the evolution of spatial and urban solutions. Changes in various fields of life (economy, culture, etc.) have influenced the changes in its style. Moreover, they have an impact on the physical side of the anthropogenic space [30]. Globalization and computerization have contributed to the modification of social relations and homogenization of space in all dimensions [31]. The dominant role is played by the flow of information, idea, capital, goods and also people [32]. The quality of life indices for the certification and monitoring of the member cities are the premises of the local councils' actions. The modern ideas of spatial planning allow claiming that the sustainable development and the idea of Slow City are based on similar, or even often the same, assumptions. Duplicating the same norms in sustainable planning and the idea of the movement has become the norm emphasized in the modern debates on cities development. Consequently, the social awareness increase, spatial structures are harmonized, the elements of the environment are respected and the results of intensive urbanization are balanced. As a result, all of the above-mentioned elements become the widely acknowledged rule of good practices in planning and spatial management [30]. Moreover, they have the chance to be more widely implicated in other, more complex and more urbanized spatial arrangements.
The integral element of city development is a constant process of changes in which one of the leading roles is assigned to the processes of revitalization. It is a process that includes comprehensive operations in old towns, old districts neglected in terms of the economy, aesthetics, space, infrastructure, communication and functionality. In numerous points, the process converges with the idea of Slow City and sustainable planning. It leads to the prevention of social exclusion, facilitates socio-economic development and it also leads to the improvement of the quality of life of the local society. The revitalization process must be conducted according to the principles of sustainable development with the integration of social, spatial, economic, cultural, construction, investment and ecological aspects within the determined aim [33,34]. The quoted scientific and technical discourse fully confirms the necessity for the integration of the idea of Slow City, the sustainable development and technical actions (f.eg. revitalization) in a widely-acknowledged planning and land use of Cittaslow towns.

Study Areas
The study areas were small towns, which are Cittaslow members, in the Italian regions of Tuscany and Umbria, and the Polish region of Warmia and Mazury ( Figure 1). The reason for choosing Cittaslow network for the study is the fact that it is a consistent network of small towns. Moreover, it gives the possibility of conducting the research on various urban organisms. While achieving the objectives, Cittaslow solicits raising the effectiveness of economic growth, it puts emphasis on a high level of education and helps in reducing poverty; it also develops newer and newer innovative economic projects. The objectives fit in the ideas of sustainable development. Among strong points of Cittaslow network, one can list [35]: • possibility of uniting nationalities that exchange experiences and create the new quality of local life; • creating common frames for development based on "the true-life" values; • possibility of individualized towns development based on endogenous resources; • creating a common brand that would assure the identification on the world scale as well as on the national (local) scale; • building partnership with inhabitants for the need of taking developmental decisions; • building the identity of the towns' inhabitants (Cittaslow Sunday/Week); • exchanging good practices, including study visits; • building common socio-economic undertakings.
Cittaslow network unites mostly historical towns which drew the attention of inter alia the scientists from Massachusetts Institute of Technology City Science (USA). They stated: "We went back in time and looked at towns in which we all would like to be-a lot of them belong to the historical European towns". They think that towns that work the best are towns that had been organized before the car was invented. The towns include districts with all essential everyday life facilities. It is the so-called [36].
The value of small towns is emphasized also in The European Commission studies on the basis of which one can state that [37]: • the towns have influence on the well-being and the living not only of their inhabitants but also the surrounding rural population, • they make public and private service centers and they collect knowledge, create innovations and infrastructure on the local and regional scale, • they make the base of urban regions and they give the character of regional landscapes, and determine their distinctiveness, • their structure of growth and development in Western Europe makes the best sustainable urban system in the world, • generic features of small and medium-sized towns, especially the human dimension, living conditions, the friendly nature of the districts and geographic rooting and historical character, make the perfectly sustainable urbanization, • they are the indispensable element to prevent depopulation in rural areas and migration to towns; they are also necessary to reach regional sustainable development, unity and sustainable Europe.
These regions were selected for the study due to similarities in their spatial layout. The analyzed regions are highly attractive and popular tourist destinations that are widely visited by domestic tourists as well as tourists from other countries in Europe and the world. The popularity of the studied regions can be attributed to their unique environment, landscape, topographic features and cultural heritage, including historical urban fabric and world-class monuments such as castles, churches and parks [38][39][40][41]. Moreover, Tuscany is the cradle of the Cittaslow movement, whereas Warmia and Mazury is a region with the highest number of Cittaslow towns in Poland. One should mention that Polish National Cittaslow Network is the second in the terms of the number of town members in the world [35].
Small towns are characterized by similarities and differences in their topographic features, historical factors which influenced the evolution of urban structures, culture, habits, building traditions, as well as climate which shaped the local architecture. The above factors are responsible for the differences and similarities in the spatial structure of small towns, but towns that are members of the Cittaslow network pursue similar goals and strive to fulfill modern needs and aspirations. The analyzed towns differ considerably in population which ranges from 505 to nearly 28,000 in the studied Italian regions, and from 1964 to more than 23,000 in the Polish region.

Italian Towns
Tuscan and Umbrian towns are much older than their Polish counterparts. Some Italian towns were established in Roman times, and they are regarded as the cradles of European civilization [42]. The founding dates of some towns cannot be determined accurately due to the turbulent history of the Italian peninsula. Small settlements and Roman military camps were transformed into towns that were destroyed and reconstructed on numerous occasions over the centuries. Other towns were built as part of the urbanization effort of the Roman Empire [43,44]. Topographic features and other environmental factors significantly influenced the spatial structure of Italian towns, most of which have a highly irregular street pattern [45]. However, these factors have little bearing on the preserved urban fabric which dates back to later periods in history. The present size and population of Italian towns is unrelated to topographic features [46]. The territorial reach of Italian towns continued to expand as their economies grew in successive centuries, but their original layout has been preserved to this day. The study covered 15 towns in Tuscany and 11 towns in Umbria:

Polish Towns
The founding dates of towns in the Polish region of Warmia and Mazury are much easier to determine. Source documents citing charters that granted town rights to settlements in Warmia and Mazury have survived to this day. The relevant dates are also easier to establish because Polish towns were founded later than their Italian counterparts. Warmian and Masurian towns were granted charters because they were established on virgin territory. Their founding dates are indicated in historical documents [47].

Methods
Multidimensional analyses and evaluations are required to assess the multiperspective functioning of historical towns and the ability of their spatial structures to meet the needs and aspirations of modern communities. The evaluated towns are characterized by similarities as well as differences in this respect. The objective of the applied original research methods was to verify the assumption that sustainable municipal development is closely related with spatial attributes. Some of the applied methods were based on the approaches that are widely described in the literature [13,24,27,28,[46][47][48][49][50][51][52][53][54][55], and they involved analyses of the current status of historical urban layout. The remaining methods were developed by the authors, and they rely on subjective evaluations of the towns' spatial structure which is defined by the historical urban fabric and architectural features. This approach is largely universal, and it can be applied in towns situated in various regions of the world. The spatial structure of the analyzed towns was assessed with the use of three criteria:

1.
Multi-criteria evaluation of the spatial structure of small towns; 2.
Evaluation of the influence of spatial attributes on the townscape; 3.
Analysis and evaluation of the spatial structure of the studied towns.

Multi-Criteria Evaluation of the Spatial Structure of Small Towns
The aim of this evaluation was to determine the extent to which a slower pace of life in small cities contributes to sustainable development. Due to the large number of analyzed towns (22 towns in the Polish region of Warmia and Mazury, 15 towns in Tuscany, and 11 towns in Umbria, Italy), a quantitative research method was applied to identify and systematize the key elements that determine the quality of urban spaces. The following elements were taken into consideration:

1.
Founding date-iconographic sources and an analysis of the literature relating to the history of Italian towns [56,57]. Polish towns were evaluated mainly by reviewing German-language literature and iconographic sources dating back to the 19th century [58,59]. The aim of the analysis was to identify differences in the spatial layout of the examined towns and to determine possible correlations between a town's founding date and its urban layout (Table 1).

2.
Topographic features-iconographic sources (maps, satellite images, etc.). The location of the studied towns was analyzed relative to the predominant landform types, including hills, river bends, banks of a river or another water body. Topographic features exerted a considerable influence on the layout of urban structures ( Table 2).

3.
Urban layout-iconographic sources (maps, satellite images, etc.). The urban planning solutions in the studied towns were analyzed in view of typical Medieval town patterns: • towns that evolved from the existing settlements; • towns built around Roman military camps; • towns built in cruda radice (from a "raw root"), usually along or at the crossroads of major transportation routes.

4.
Size and shape of market squares-iconographic sources (maps, satellite images, etc.). The size and shape of market squares in Medieval towns were adapted to the towns' area and economic status in the region. Market squares were assessed based on their size, organization and role in the contemporary urban structure (Table 3).

5.
Town area enclosed by fortified walls, present-day area, increase in developed area (IDA) since establishment-iconographic sources (historical maps, satellite images).
At the time of their foundation, the area of the studied towns was defined by fortified walls or topographic features (hill, bank of a river or another water body). The original and present area of the evaluated towns was calculated from satellite images with the use of the AutoCad software package. The territorial reach of Medieval towns was determined based on an analysis of satellite maps and the authors' knowledge of the history of urban development in Europe. The analyzed towns had undergone numerous transformations throughout history, and the calculated built-up area within fortified walls was only a rough estimate, but it was sufficient for the needs of this study. An accurate determination of the examined towns' original area would require archeological surveys which fall outside the scope of this study.
Over the centuries, continued economic growth led to the territorial expansion of the studied towns. The towns' original and present area was compared, and the attractiveness of historical urban fabric relative to modern forms of urban development was evaluated with the use of the following indicator: where: IDA-increase in developed area; PA-present area; TAF-town area at the time of foundation. • towns were built around Roman military camps; • towns developed around the existing settlements (irregular urban layout).

2.
Early Medieval period (8th to 10th century) • towns were built around Roman military camps; • towns developed around the existing settlements (unplanned urban layout); • towns were built in cruda radice (from a "raw root") with irregular urban layout or a grid street pattern.

3.
Medieval period (11th to 14th century) • towns developed around the existing settlements (irregular urban layout); • towns were built in cruda radice (from a "raw root") with irregular urban layout or a grid street pattern.

Evaluation of the Influence of Spatial Attributes on the Townscape
This stage of the research involved cartographic methods as well as field surveys of Polish towns and selected Italian towns. Urban structures were evaluated by directly experiencing the distinctive atmosphere of historical towns. Direct observations were supplemented by analyses of photographs and video footage. Iconographic sources such as maps and satellite images were also used to examine the key elements of the urban structure. These research methods supported assessments of individual spatial attributes which stimulate the senses and enable spectators to experience the unique/distinctive atmosphere of a place (genius loci). The following factors were taken into consideration:

1.
Urban layout-cartographic sources, observations and field surveys. The extent to which Medieval urban forms have been preserved was evaluated to determine whether and to what degree the development of the studied towns affected their original design. According to Camillo Sitte, an urban theorist whose work exerted a considerable influence on contemporary urban planning, the designers of Medieval towns in Italy appreciated the value of irregularity and esthetics in the urban form [54]. The evolution of Italian towns was influenced by topographic and environmental features as well as their territorial expansion over the centuries. Polish towns were established based on a different set of principles. Their streets followed a strict geometric pattern that was adapted to local conditions, including topographic and environmental features. Towns are living organisms that evolve over time. For this reason, the functions of Medieval towns should be adapted to modern requirements without compromising their original urban layout that has been shaped by historical, topographic and cultural factors. Street patterns were analyzed in: • Italian towns with a free-form urban pattern and an irregular street network, where the junction of the main roads acts as a focal point in the town center; • Polish towns with a grid street pattern, rigid compositional axes and a clearly defined central area.
The urban forms in both Polish and Italian towns are aesthetically pleasing, but they evoke completely different perceptions of urban space (Table 4).

2.
Urban open spaces-urban open spaces such as municipal squares, pocket parks and small public parks were analyzed in Italian and Polish cities. The evaluated open spaces differed in form and design, they were user-friendly and attracted local residents as well as tourists (Table 5).

3.
Architecture-local surveys of the quality of urban space. Buildings and structures are the key elements of the townscape, and they build a sense of local identity. Urban architecture is responsible for the distinctive atmosphere of a place and subjective perceptions of the built environment. The unique ambience of Medieval towns can be largely attributed to historical architecture. The form, layout, scale and detail of architectural design, the applied building materials, their texture and color directly influence the human senses. Non-material factors, such as the town's founding date and important historical events, are also powerful stimuli that generate positive perceptions of space [60]. The historical architecture of the studied towns was analyzed to determine its influence on esthetic and sensory perceptions of space. Architecture is the main element of the urban fabric which influences the quality and attractiveness of space. A town's architecture stimulates the senses and creates an esthetic experience (Table 6).

4.
Conservation status of historical architecture-iconographic sources, field surveys. The conservation status of historical architecture in the studied towns was evaluated based on source documents and knowledge of the history of architecture. The results were used to estimate the date of construction, identify the architectural style and assess the authenticity of the analyzed buildings (Table 7).

5.
Scale of urban development-the area of the studied towns was analyzed in view of historical changes in their territorial reach relative to their original area. The territorial expansion of Medieval towns was an inevitable consequence of their economic growth. The historical architecture in the center of small towns has to be preserved against the background of modern development to maintain the esthetic composition of the urban structure. This is a necessary prerequisite for preserving the unique identity of historical towns, and it demonstrates that towns are living organisms that evolve over time (Table 8).

No. Criterion
Perceptions of Space

Squares
• user-friendly spaces; • architecture and green infrastructure contribute to social integration and a sense of local identity.

Municipal parks
• recreational areas; • architecture and green infrastructure contribute to a sense of identity and responsibility for one's place of residence.
Source: own elaboration based on Wejchert [51], Montgomery [53].    The factors listed in Table 8 were used to evaluate the quality of urban space in historical towns. The quality of the historical urban fabric is determined by perceptions of structural archetypes, distinctive features that contrast with contemporary urban structures outside the historical center, as well as compositional factors such as the scale of urban development and urban forms.

Analysis and Evaluation of the Spatial Structure of the Studied Towns
An intuitive (holistic) research method was applied to determine the extent to which the distinctive ambience (genius loci) of historical towns shapes the urban landscape in the evaluated regions and contributes to an improvement in the local standard of living. The influence of urban design elements, including structures, buildings, town blocks, streets and squares, on the quality of urban space was evaluated in Polish and Italian towns. Historical architecture and urban design are manifestations of a region's cultural heritage, and they evoke strong emotional responses. The analysis revealed strong links between the quality of local life and the protection of heritage sites. These relationships have evolved differently in Italian and Polish towns, which can be attributed to differences in culture, climate and history (Table 9). Table 9. Preservation of historical spatial components in the studied towns.

Preserved
• town blocks preserved in original form; • preserved historical architecture; • distinctive atmosphere of a historical town.

Partly preserved
• minor modifications of historical components exert a negligible influence on the overall legibility of urban design; • foreign and modern architectural forms exert a minor effect on historical urban design; • the existing urban structure has a predominantly historical character.

Neutral
• considerable modifications of historical components significantly compromise the overall legibility of urban design; • a predominance of foreign architectural forms significantly detracts from historical urban design; • the structural layout of historical towns is difficult to identify.

Not preserved
• the legibility of the original urban design has been lost; • architectural design does not make a reference to historical forms; • urban spaces do not reflect the town's history.

Results
The data collected with the use of the described research method were interpreted based on three criteria for analyzing the spatial structure of the studied towns. The results of the study are presented separately for each stage of the conducted research for greater readability.

Multi-Criteria Evaluation of the Spatial Structure of Small Towns-Results
Italian towns differ considerably in founding dates because they were established from Roman times to the Medieval period (Figures 2 and 3).
Most of the analyzed Polish towns were established in same century (Figure 4). The spatial structure of Italian and Polish towns was determined by topographic features and environmental conditions. All towns were founded in areas with favorable terrain characteristics (hill with steep slopes, river bend, bank of a river or another water body) which acted as natural barriers and protected the inhabitants against enemies ( Figure 5).
A centrally located market square has always occupied an important place in the spatial structure of the studied towns. The size and shape of historical market squares differ considerably in the analyzed urban structures, but most towns have rectangular market squares ( Figure 6).
The size of urban structures in Medieval towns was determined by the towns' economic status and technical capabilities (Tables 10-12). The average area of Medieval towns within fortified walls was determined at 3.89 ha in Tuscany, 6.04 ha in Umbria, and 5.37 ha in Warmia and Mazury. Over the centuries, economic growth fueled the expansion of the analyzed urban structures outside defensive walls. Tables 10-12 present the developed area of Italian and Polish towns, not the area enclosed by their administrative boundaries (which includes undeveloped areas such as forests, water bodies and agricultural land).
Only built-up areas with the accompanying green infrastructure were measured based on orthophotomaps.
The area enclosed by fortified walls was used to calculate the relative area of the market square, which was expressed as the ratio of market square area to developed urban area (Figures 7 and 8). The average relative market square area was determined at 2.15% in Tuscany, 1.91% in Umbria, and 10.92% in Warmia and Mazury.
As demonstrated by Figures 9 and 10, the studied towns continued to expand dynamically throughout history. The greatest territorial expansion was noted in the 19th and 20th centuries. The character and density of urban development also evolved, and this process was accompanied by changes in urban design and architectural style. The average increase in developed area was determined at 19.89% in Tuscan towns, 16.50% in Umbrian towns, and 25.35% in Polish towns in the Region of Warmia and Mazury.   [61] and Ross [63]. Key: n.e.d-no exact data available.

Evaluation of the Influence of Spatial Attributes on the Townscape-Results
An analysis based on the adopted criteria (Tables 4-8-urban layout, public urban spaces such as municipal squares, pocket parks and municipal parks, architecture, scale of urban development) revealed that historical solutions considerably influenced urban planning in successive centuries. Historical town centers are characterized by different scale, density and type of development than other built-up areas, and they constitute the focal points in the studied towns (Tables 13-15).

Analysis and Evaluation of the Spatial Structure of the Studied Towns-Results
The distinctive atmosphere (genius loci) of a town is determined by various components of the urban fabric, including material factors as well as non-material factors which cannot be quantified, but which influence the human senses and are responsible for esthetic perceptions of space. The studied towns differed considerably in subjective perceptions of esthetic appeal (Tables 16-18).

Discussion
Cittaslow towns are conjoined with a rich and long history as well as the charm of places ostensibly frozen in time. While analyzing the localization conditions of the Cittaslow network, it is hard to find any regularity. They represent different geographical, historical and most of all spatial types. They are conjoined mainly by the fact that they have historical centers and/or protected areas. Cultural heritage, valuable landscape, local culture and language are appreciated by Cittaslow towns' authorities, inhabitants and tourists. "Slow" cities lay emphasis on all of the values and owing to that they get unique character [67,68].
Historical planning solutions elicit the strongest emotional responses in perceptions of urban space; they contribute to a sense of local identity and create a sense of responsibility for one's place of residence. The protection and promotion of these values constitute the fundamental tenets of the Cittaslow philosophy [69,70]. It should be mentioned that towns that join Cittaslow network commit themselves to keep the cultural heritage connected with the way of living and living conditions [71,72]. Therefore, they achieve the goals of the movement connected with taking care of the historic urban fabric, renovating monuments and towns' aesthetics [73]. It is connected with maintaining and cultivating their historical identity which is not always connected with the functional demands of modern times. Technical and technological development, fire regulations or the civilization progress in general are a challenge in adjusting historical structures to the modern demands. Unlike big cities, small towns have no possibilities for developing industry, building large shopping centers or thoroughfare [74]. The analyzed Polish and Italian towns have many similarities, such as the size of the original urban settlement. However, they differ in other respects, which can be attributed to cultural and climatic differences. Historical urban planning solutions play an important role in this comparison because they testify to the towns' rich cultural heritage which followed European trends in urban design and architecture. The analyzed urban layout is also indicative of differences in local building traditions [75][76][77]. Qualitative improvement of the built environment should acknowledge local divergence and models as the manifestation of local identity. The greater awareness of key social factors in urban planning and creating architecture influence the higher potential of social sustainability of residential environment [78]. The extent to which urban design components determine the attractiveness of historical towns was evaluated based on the results of field surveys and analyses of iconographic materials. This is a very important consideration in small towns where the physical attributes of space are closely related with the spiritual needs of public space users. It is particularly visible in Slow Cities that apart from rich cultural heritage also have other important endogenous assets: widely underestimated bond and social awareness, and cooperation skills that stem from a deep sense of belonging to the inhabited place [67,79]. Consequently, the inhabitants feel like taking responsibility for their town which is definitely easier to be done in small local societies, where unlike in cities, the bonds are usually really strong [26,74,80]. The applied research methods supported the identification of links between the quality of historical urban space and the local standards of living. These methods were also successfully used to determine why small historical towns uphold the Cittaslow philosophy and whether different urban layouts in Polish and Italian towns create equal opportunities for implementing the principles of the slow living movement.
The analyzed Italian towns do not differ considerably in urban layout despite the fact that they were founded in different periods of time. The free compositional arrangements are dominant in Italian towns, which could have been connected with transforming former settlements, topography, climate and historical conditioning [81]. The factors, regardless of the widely-acknowledged in the Middle Ages rules of town layout, based on the chessboard layout, made the structure of Umbria and Tuscany to exceed the rules of urban composition created centuries ago [82,83]. Regardless of their founding date, the compared urban structures have many similarities, which suggests that climate and local architectural traditions played a key role in the development of urban forms. The layout of Polish towns is completely different than Italian towns' layouts. It corresponds to the general rules for founding a town that were current in the Medieval Times. Polish towns are characterized by more regular layouts which are based on the chessboard layout with a regular market in the middle and a perpendicular grid of streets. [45,48]. Nearly all of the evaluated towns in the Region of Warmia and Mazury have a regular, geometric street pattern with a centrally located market square, a fortified castle and a church.
Towns founded in different historical periods are also characterized by varied urban layouts. A grid street pattern is rarely encountered in Italian towns. In these towns, narrow streets are chaotically distributed, and dense development offers shade and refuge in the hot summer months. In the Middle Ages, dense settlement also increased security because smaller areas were easier to defend against enemies. That feature characterizes towns in the whole Europe [84]. Most of the evaluated towns abound in historical architecture which makes a reference to local building traditions and creates urban forms that are characteristic of the cultural landscape of Tuscany and Umbria. A completely different urban layout was observed in Polish towns. Warmian and Masurian towns were founded on a rectangular street plan, and they were divided into blocks of dense development with a market square in the center [85]. The original urban layout is still legible in most towns. Despite the above, the historical architecture of Polish towns was largely destroyed at the end of World War II. Consequently, the most valuable and the oldest parts of buildings, sometimes the vivid symbols, buildings acknowledged as the elements that shaped the individual landscape of the towns were degraded. Unfortunately, the post-war reconstruction effort, as well as their development, were very often unsuccessful and they often worked the opposite to the historical functional layout, arrangement and the scale of building that had been functioning in historical Polish towns for centuries [33,86]. At that time Poland belonged to the Eastern Block which negatively influenced the maintenance of historical identity of the towns. The post-war reconstruction was done without respect for historical assumptions which consequently led to losing towns' historical character [87].
Polish and Italian towns were established in areas with different landform and natural features. Most Italian towns were founded on steep hills that are ubiquitous in Tuscany and Umbria [88][89][90]. Hills are local topographic features which acted as natural barriers and protected towns and their inhabitants. In contrast, north-eastern Poland abounds in rivers and lakes which were the main focal points during the establishment of Medieval towns. Many Polish towns were nested in the bend of a river. It was done mainly because a river was indispensable for life. It provided water for people and animals, allowed for gathering food, watered crops, and fertilized soils. Close vicinity to rivers had also served military purposes [91]. Security was of the utmost concern in Medieval times, and towns were founded in areas where local terrain features offered effective protection. Moreover, a river facilitated trade and communication enabled professions that required the presence of water; it allowed draining the rain and urban pollution or using energy resources of river flow. Its close vicinity to a large extent influenced the economic development and it also had an impact on political, demographical and social relations of towns located close to the river [91].
The size of Medieval towns was determined by their ability to satisfy the residents' basic needs, and the complex process of building fortified walls favored dense development. Throughout the centuries, defensive walls limited the territorial expansion of cities whose size was fairly similar and representative of the level of technological advancement in the Middle Ages [92]. The average area of towns enclosed by fortified walls was similar in all studied regions, although it was somewhat larger in Italian towns (Cortona, Amelia and Todi). Polish towns were characterized by similar size, with the exception of Gołdap and Ryn.
Traders sold their goods in centrally located market squares which fueled the economic growth of Medieval towns. The market square was the heart of the town, and its location influenced the urban development pattern in the remaining parts of the town. The size and shape of the market square were determined by the town's area and street pattern [92]. The vast majority of towns in the Region of Warmia and Mazury have rectangular and square markets. Only three market shapes were identified in this region, which could be attributed to the fact that Polish towns were founded in the same historical period. The shape of market squares in Italian towns is more varied. A trapezoidal shape was most frequently encountered, followed by rectangular markets and markets with a complex shape. A total of seven market shapes were identified in the study, but none of the analyzed Italian towns had square-shaped markets. The observed variations are associated with considerable differences in the founding dates of Italian towns.
The functions of market squares have been expanded in the modern times. Market squares are not only the hubs of commercial and economic activity, but they also serve representative and recreational purposes [93,94]. They are historical landmarks that contribute to a sense of local identity and attract tourists and potential investors [95]. The relative area of the market square differs considerably between Italian and Polish towns. The studied towns in the Region of Warmia and Mazury are characterized by significantly higher relative market area which was determined at 10.74% on average and reached up to 20% in Nidzica and Ryn. In Italian towns, relative market square area approximated 10% only in San Miniato (Tuscany). These variations can be attributed to differences in founding dates. Polish towns were established later than their Italian counterparts, and most of them were not built around the existing settlements, but from a "raw root". From the beginning of their existence, Polish towns were adapted to local needs, and the relative proportions of the market square to the remaining forms of urban development could be freely shaped.
Towns are living organisms that continue to evolve, and their territorial reach changes throughout time. The growth and expansion of towns are determined by their regional and supra-regional status, economic performance, quality of space, and standards of living [96][97][98]. These factors influence the rate of urban expansion in the course of decades and centuries. In Polish towns, built-up area increased most rapidly in the 19th century when small factories (mills, breweries, lumber mills, brick factories) and railway lines were built in the Region of Warmia and Mazury [47]. The expansion of Italian towns was less dynamic due to topographic barriers (closed-form cities established on hills).
Preservation of historical spatial components significantly influences the shaping and perceptions of urban space. The elements, such as urban layouts, i.e., streets, squares, urban interiors and architecture, create the picture of historical changes. The elements to a large extent influence the spatial identity of towns [99]. In the towns of the analyzed areas, the differences are significant. All preservation criteria have been met in Umbrian towns, excluding Torgiano and, partly, Preci. The historical environment of Tuscan towns has also been successfully preserved (excluding Bucine, Civitella in val di Chiana, Pratovecchio, San Vicenzo and, partly, Abetone Cutigliano). The historical urban layout of Polish towns has been partly maintained or lost. Only the first two criteria in Table 15 have been preserved to a satisfactory degree.
The genius loci notion is indispensably connected with the perception of town space. It is not material, the places are special. They are the source of spiritual experience connected with history, the meaning, symbols and aesthetics which are individually perceived. Urban space, individual in every case, is prestigious, "the tokens" of a town with which the inhabitants identify. This relation equals the sense of belonging to a given cultural circle [100]. The significance of the places is unquestionable as it is consolidated in social awareness by particular events, representational buildings or functions [101]. In urban space, it is significant as town planning and architecture enrich the spiritual sphere, they are born in social space which remains as the space full of meanings and symbols, especially in historical towns [102]. For this reason the genius loci is the most subjective and elusive factor in evaluations of historical urban forms. Historical downtown areas differ considerably from the remaining parts of the urban fabric, and they have distinctive features that have been adapted to contemporary needs without a loss of local identity. The results of the study revealed that the preservation of historical spatial components is directly responsible for the unique ambience of historical towns. This observation is validated by the fact that Torgiano and Preci are the only Umbrian towns without a genius loci. There are no discernible elements that would signify the rich history of the town. The urban layout and architecture do not have hallmarks of historical solutions as space is organized rather in a modern way. In Tuscany, the pervading spirit of a place is also most strongly manifested in towns whose historical environment has been successfully preserved. Polish Medieval towns have been most severely deprived of their historical ambience, and the genius loci has been retained in only six towns (Działdowo, Górowo Iławeckie, Nowe Miasto Lubawskie, Orneta, Pasym, Reszel). In the remaining cases, the spatial solutions do not have any historical features. After World War II their urban layout was changed and the architecture of socialism vividly stood out from the stylistics that had been created for centuries.
To summarize, one can state that towns that ate members of Cittaslow network develop according to the same set of criteria which is at the same time the benchmark of developmental standards. However, it is so profound that it allows for shaping the local specialization in an individual way. Every town has its own unique endogenous potential which under some conditions can contribute to real development and raising its inhabitants' quality of life [67,103], and the same time achieving the goals of functioning of Cittaslow movement.

Conclusions
Small historical towns offer a glimpse into Europe's wealthy cultural and architectural heritage. The original spatial structure of these towns has been preserved to a varied extent. Cittaslow International is a network of small towns which prioritizes the quality of life over the hustle and bustle of modern cities. The article analyzes and evaluates historical spatial forms in Cittaslow towns situated in selected European regions with a different culture and history. The relationships between the urban layout and the local quality of life based on sustainable development and protection of cultural heritage were examined.
The study revealed that the Medieval layout of Polish and Italian towns can be successfully incorporated in the modern urban fabric to promote the Cittaslow philosophy of sustainable development and slow living. Cittaslow towns are characterized by small size and population, small-scale urban development and user-friendly public spaces that promote a sense of local identity and foster responsibility for one's place of residence. Historical spatial layouts of the towns (downtown built-up areas) are not adjusted to the modern functional specificity of a big city and its dynamics. There is no possibility for industrial development, building large-areas shopping centers, organizing public transport or building thoroughfare. The small scale of the area in the town center makes social integration an inevitable element of its functioning.
Moreover, historical towns have distinctive spatial features, including small squares, narrow streets that are closed off to vehicular traffic, and historical architecture that triggers emotional responses. These components facilitate the implementation of the Cittaslow concept that advocates harmonious relations between the past, i.e., the preservation and promotion of local traditions and cultural heritage, and the future, i.e., economic growth and an improvement in living standards. Even though Polish and Italian towns have differences in their layouts and character, they still have a common feature-the cozy space organization which being combined with old but well-functioning architecture corresponds to Cittaslow assumptions.
The analyses demonstrate that the components can be applied for spaces developed in a various way, both Polish and Italian towns. Historical urban fabric favors pedestrian movement, which contributes to the formation of stronger social bonds, unlike in large metropolitan areas where social interactions are scarce. Dense development in small towns eliminates physical barriers to human contact, such as extensive open spaces, wide roads and large plots of land zoned for development. These findings indicate that in order to preserve the historical urban fabric, the structure should not be interfered with. Effective planning policies are required to preserve the scale, unique character and identity of historical towns, and they facilitate the achievement of Cittaslow goals. Historical spatial layout and urban structures promote local arts, crafts and services. Preservation of local traditions and cultural heritage contributes to the development of tourism, and modern technology (such as remote work arrangements) improves the quality of local life.
Historical urban fabric is an element of cultural heritage and one of the pillars of the tourism industry which creates ample opportunities for promoting the values of towns and regions. Therefore, the results of this study can be used by local authorities to establish cooperation networks, promote their towns and regions, and exchange experiences relating to the implementation of local development policies. The proposed research methods are largely universal and can be applied to analyze the spatial structure of small towns in other regions of the world. The study adds to the existing body of knowledge relating to the development of historical urban forms and spatial layout. The possibility for comparing Polish and Italian towns, which differ in many above-mentioned aspects, proves the point. The methodology is therefore universal and can contribute to the comprehension and further development of the Slow City idea in various regions in the world. Moreover, it can be used as a key element in building local urban revitalization programs for historical towns. Such practice is commonly applied in urban planning in numerous European regions. However, during conducting the research one should be aware of the limitations connected with the lack of a unified database for given countries and the limitations of the access to iconographic and cartographic resources.  Data Availability Statement: Publicly available datasets were analyzed in this study. This data can be found here: http://asict.arte.unipi.it/index.html/ (accessed on 18 August 2020), http://www.cittaslow. org/ (accessed on 30 August 2020), www.istat.it (accessed on 30 August 2020), www.cittaslow.it (accessed on 30 August 2020), www.google.com/maps (accessed on 30 August 2020), https://cittaslowpolska.pl/ (accessed on 30 August 2020).

Conflicts of Interest:
The authors declare no conflict of interest.