Ключевые слова: ancient, archeology, awe, beautiful, calcium, cave, cavern, caving, chambers, cracks, damp, dark, discovery, espeloelogo, europe, exploring, formation, geologist, geology, grotte, grotto, hell, inside, interior, jama, karst, landmark, light, limestone, mineral, mountain, mystic, natural, nature, paradise, postojna, rock, slovenia, speleology, stalactite, stalagmite, stone, tectonic, tourism, travel, underground, water,