Ключевые слова: ancient, attraction, beautiful, cave, cavern, caving, colorful, column, dark, deep, environment, espeloelogo, europe, formation, geologic, geologist, geology, grotte, grotto, hall, inside, interior, jama, karst, landmark, landscape, limestone, mineral, mountain, national, natural, nature, park, postojna, rock, sand, slovenia, speleology, stalactite, stalactites, stalagmite, stalagmites, stone, tourism, train, travel, tunnel, underground, wall, water,