The coastal area of the Danube had the greatest strategic importance in the preservation of the waterway, which was the most important road in this part of Europe until the late 19th century. On the banks of the Danube were located the cradle of many civilizations that were built by European values and identities created by different people. As a natural border Danube has played a significant role in military strategy in the struggle for supremacy and domination of European territories, which are the most significant and most monumental fortress in Serbia, built right on the banks of the Danube. Cultural Route ?Fortresses on the Danube?, which floats our sector of the Danube, displays our most important monuments of military architecture in this part of Serbia, the preserved remains of seven fortresses: Bac, Petrovaradin, Belgrade, Smederevo, Ram, Golubacka and Fetislam. Mentioned fortress are an important resource for sustainable tourism development and an important part of the cultural corridor not only in Serbia, but also South-Eastern Europe, which value is recognized by UNESCO. A special segment of the tourism industry in the development of the Danube region represents the development of geotourism as tourism specific niche markets Danube fortresses, and other objects of natural and cultural heritage of the Danube basin is recognized as an interesting tourist destinations and sites worth visiting and retention during a cruise on the Danube. Protection of cultural heritage as a unique and irreplaceable wealth, is very important for the Republic of Serbia and the Danube Region. The development of ?cultural routes? and other forms of cluster connectivity properties of cultural heritage will help better interpretation of heritage and the creation of cooperative networks that will provide obtaining the status of an important heritage resource in the development of cultural tourism and to be involved in politics purposeful tourism planning. Moreover, investments in the restoration of the Danube fortress create the conditions for a greater volume of tourist traffic and a significant share of foreign tourists from cruise ships in their unique offer.

quently analysed approaches and the motivational basis for visiting can show how much the protected nature and healthy environment matter to the tourists. Based on the internal motivators, we examined whether the tourism in Đerdap is controlled, on a smaller scale, and qualitatively focused. A total of 484 respondents participated in the survey research. The comparison of attitudes was performed in relation to the demographic attributes of the respondents (gender, age, education). Target groups of tourists who prefer sustainable tourism have been identified. Sustainable tourism is a significant determinant in the further development of tourism in the protected area National Park Đerdap. The results of the research, based on 12 statements, performed t-testing and one-factor variance analysis (ANOVA), show that the visitors' greatest interests are related to the environment (natural as well as cultural value of the area). The researched motivational factors (new experiences and events, relaxation and rest, acquiring new knowledge-cultural and educational motivation) are based on sustainability. The results of this research can be applied in practice by implementing them through various management and marketing plans in the National Park Đerdap.

Astrotourism is a specific, new and perspective form of tourism which stands out from the mass tourist movement with special program that includes visits to astronomical observatories, with required astronomical observations. This form of tourism is considered to be "niche tourism" or special form of tourism which is intended for individuals or small groups, creating a diversity of offers in destinations. Astrotourism is now a modest, but not negligible part of the tourist destinations that wish to enrich its tourist offer. Like other small countries, Serbia has no spectacular planetarium, giant observatories and telescopes, but there are sufficient resources, with an interesting history, on the basis of which it can be offered to astrotourists original programs whose carrier should be Astronomical Society "Rudjer Boskovic" in collaboration with the Astronomical Observatory in Belgrade.

An overview of garden city development as well as its significance in urban planning, are given in this paper. The garden city idea, which had a major role in the 20th century urbanism, was born in London. The author of this concept is Ebezener Howard who is considered a pioneer of modern urban planning.

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