Ключевые слова: ancient, attraction, beautiful, calcite, cave, cavern, caving, dark, darkness, deep, destination, drop, earth, ecological, ecology, ecosystem, ecotourism, europe, exploration, formation, geology, ground, hidden, inside, light, limestone, mineral, moist, mountain, mystery, natural, nature, pattern, popular, resource, rock, rocky, safety, stalactite, stalagmite, stone, tourism, tourist, travel, under, underground, unusual, wall, wet,