Ключевые слова: aerial, aerial view, aleko, balkans, biosphere, bulgaria, drone, environment, europe, forest, hill, ice, landmark, landscape, meadow, mountain, mountaineering, natural, nature, outdoors, panorama, park, platoto, recreation, reserve, scenics, seasons, sight, sightseeing, ski, skli slopes, snow, sofia, sofia city region, summer, tourism, travel, tree, view, vitosha, vitosha mountain, wilderness, winter, wood,