Ключевые слова: architecture, attraction, balkans, building, building exterior, bulgaria, bulgarian, capital cities, city, cityscape, clear sky, cloudless, communism, communist, convention center, day, downtown district, eastern europe, entertainment building, europe, european, exterior, facade, famous place, fountain, front, garden, landmark, large, modern, national landmark, national palace of culture, ndk, place, public park, sight, sightseeing, sofia, spring, structure, travel destinations, tree, tulips, urban, water,