Ключевые слова: acid, adventure, ancient, attraction, below, castellana, cave, caverns, caving, dark, darkness, dome, effect, erosion, formation, geological, geology, grotte, grotto, growth, hole, italy, karst, limestone, mine, mineral, mountain, natural, nature, nobody, park, rock, speleology, stalactite, stalagmites, state, stone, subterranean, tourism, travel, underworld,