Ключевые слова: abstract, america, ancient, antelope, arizona, attraction, beautiful, beauty, calcite, canyon, cave, cavern, dark, desert, earth, formation, formations, geology, grotto, inside, landmark, landscape, light, limestone, mineral, minerals, mystery, national, natural, nature, new, old, orange, park, pattern, red, rock, sand, sandstone, scenic, southwest, speleology, stalactite, stalagmite, stone, subterranean, tourism, travel, underground, wall,