Ключевые слова: aerial, aerial view, autumn, balkans, biosphere, bridges, bulgaria, drone, environment, europe, fall, forest, golden, golden bridges, hill, lake, landmark, landscape, meadow, mostove, mountain, mountaineering, natural, nature, outdoors, panorama, park, recreation, reserve, river, scenics, seasons, sight, sightseeing, sofia, sofia city region, stone, stone river, tourism, travel, tree, view, vitosha, vitosha mountain, wilderness, wood, zlatnite, zlatnite mostove,