Ключевые слова: abandoned, architecture, balkan, beautiful, blue, building, bulgaria, buzludja, buzludzha, cloud, communism, communist, concrete, construction, destroyed, europe, european, explorer, heritage, hills, historic, historical, history, ideology, kazanlak, landmark, landscape, memorial, monument, mountain, mountains, nature, outdoor, park, past, peak, ruin, ruination, scenic, sculpture, shape, sky, socialist, socialistic, soviet, space, stone, symbol, travel, view,