Stock Photo: A tourist observes the massive underground formations in the wondrous 8.2-acre Big Room cave, 750 feet into the Earth, Carlsbad Caverns National Park, Chihuahuan Desert, New Mexico.

Stock Photo: 4340-1725 A tourist observes the massive underground formations in the wondrous 8.2-acre Big Room cave, 750 feet into the Earth, Carlsbad Caverns National Park, Chihuahuan Desert, New Mexico.