Ключевые слова: adventure, ancient, attraction, beautiful, cave, cavern, dark, dripstone, europe, exploration, formation, geologic, geology, grotto, interior, karst, landmark, landscape, limestone, mineral, mountain, natural, nature, post cave, postojna, rock, slovenia, speleology, stalactite, stalactites, stalagmite, stalagmites, stone, subterranean, tourism, tourist, travel, underground, water,