Ключевые слова: ancient, attraction, beautiful, cascade, cave, cavern, caving, chamber, collonade, column, dark, deep, earth, europa, europe, formation, gallery, geologic, geologist, geology, hall, hole, inside, interior, jama, lake, largest, limestone, mineral, mountain, national, natural, nature, passage, postojna, rock, shape, slovenia, speleology, stalactite, stalagmite, stone, tourism, train, travel, treasure, tunnel, underground, wall, wet,