Ключевые слова: ancient, bright, cave, cavern, colorful, dark, discovery, explore, geologic, geological, geologist, geology, history, illumination, inside, interior, jama, karst, landmark, limestone, minerals, monument, mountain, natural, nature, postojna, postojnska, rock, slovenia, slovenija, speleological, speleology, stalactite, stalactites, stalagmite, stalagmites, stone, tourism, travel, tunnel, underground, water, wet,