Ключевые слова: amazing, arch, background, bridge, bridges, bulgaria, bush, cave, clouds, destination, environment, europe, famous, forest, formation, grass, green, hiking, hill, landmark, landscape, mountain, natural, nature, outdoor, panoramic, park, plovdiv, recreation, river, rock, scenery, stone, summer, sun, sunny, tourism, trail, tree, vacation, view, water, wonder, wonderful, wonderful bridges, wood,