Ключевые слова: big room, calcium carbonate, carlsbad, carlsbad caverns, carlsbad caverns national park, cave, caves at carlsbad caverns, dark, deep, famous place, formation, geological, geology, guadalupe mountains, limestone, lit, mineral, national park, natural landmark, nature, new mexico, rock, scenic, show cave, southeastern, spelunking, stalactite, stalagmite, underground,