Ключевые слова: amazing, america, ancient, antique, attraction, beauty, cave, cavern, caving, column, dark, del, earth, formations, geologic, geology, grotto, hall, history, hole, indoor, inside, interior, light, limestone, mountain, natural, nature, old, park, puerto, reflection, rico, rock, rocks, rocky, scary, speleology, stalactite, stalagmite, structure, time, tourism, travel, underground, unique, usa, viento, wall, wind,