Ключевые слова: america, american, attraction, beauty, cave, cavern, crack, crevice, dark, darkness, deep, formations, geologic, geological, geology, grotto, ground, light, luray, mountain, national park, natural, nature, nobody, park, rock, rocks, scary, scenic, shenandoah, spelunking, spike, stalactite, stalactites, stalagmite, stalagmites, tourism, tourist, travel, under, underground, usa, virginia, washington,