Ключевые слова: adventure, ancient, arch, background, balkans, blossom, bulgaria, bush, cave, cavern, cliff, destination, devetaki, devetashka, ecology, ecosystem, entrance, europe, foliage, grass, indoor, inside, interior, landmark, landscape, large, leaves, lush, magic, mountain, mystic cave, natural, nature, river, rock, speleology, stalactite, stone, tourism, travel, tunnel, underground, water,