Ключевые слова: ancient, attraction, beautiful, beauty, cave, cavern, caving, darkness, earth, ecological, ecology, environment, formation, formations, geologic, geological, geology, ground, inside, interior, karst, landscape, mineral, minerals, mysterious, natural, nature, nobody, outdoor, outdoors, peaceful, rock, rocky, scenic, sediment, speleology, stalactite, stalactites, stalagmite, stalagmites, stone, stones, structure, tourism, travel, tunnel, underground, unusual, vacation, view,