Ключевые слова: ages, attraction, below, big, carlsbad, cave, cavern, caverns, chamber, column, darkness, earth, face, formation, geologic, geology, illumed, illumination, landmark, mexico, mineral, national, nature, new, nobody, park, petrology, prehistoric, rock, room, speleology, stalactite, stalactites, stalagmite, stalagmites, subterranean, underworld, usa,