Ключевые слова: ancient, attraction, beautiful, black, blue, calcite, calcium, cave, cavern, caving, colorful, dark, darkness, deep, dripstone, erosion, formation, fossil, geologic, geological, geology, green, grotto, inside, interior, karst, light, limestone, mineral, mountain, natural, nature, neon light, old, original, prometheus, research, rock, speleology, speleothem, stalactite, stalagmite, stone, travel, tunnel, underground, unusual, view, wall, water,