Ключевые слова: ancient, attraction, beautiful, calcium, cave, cavern, caves, caving, colorful, column, dark, deep, europe, formation, geologic, geologist, geology, grotte, grotto, inside, interior, jama, karst, lake, landmark, landscape, limestone, majorca, mineral, mountain, national, natural, nature, postojna, rock, scenic, slovenia, spain, speleology, stalactite, stalactites, stalagmite, stalagmites, stone, tourism, travel, underground, water,