Ключевые слова: adventure, age, awe, aweinspiring, beauty, cave, cavern, caving, cool, crystal, darkness, dim, discovery, dripping, echoes, exploration, formation, geode, geology, grotto, hidden, intrigue, limestone, majesty, mineral, moss, mountain, musty, mystery, natural, natural wonder, rock, sculpture, seclusion, secret, spelunking, stalactites, stalagmites, subterranean, tourism, travel, underground, vegetation, water, wonder,