Carlsbad Caverns National Park

Carlsbad Cavern includes one of the largest natural limestone chamber in North America

Carlsbad Caverns National Park

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This karst landscape in the state of New Mexico comprises over 80 recognized caves. They are outstanding not only for their size but also for the profusion, diversity and beauty of their mineral formations. Lechuguilla Cave stands out from the others, providing an underground laboratory where geological and biological processes can be studied in a pristine setting. - in: http://whc.unesco.org/en/list/721

Big Room

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Carlsbad Caverns National Park is an American national park in the Guadalupe Mountains of southeastern New Mexico. The primary attraction of the park is the show cave, Carlsbad Cavern.

Carlsbad Cavern includes a large limestone chamber, named simply the Big Room, which is almost 4,000 feet (1,220 m) long, 625 feet (191 m) wide, and 255 feet (78 m) high at its highest point. The Big Room is the fifth largest chamber in North America and the twenty-eighth largest in the world.

Big Room or Hall of the Giants

Big Room or The Hall of the Giants: the largest chamber in Carlsbad Caverns, with a floor space of 357,469 square feet (33,210 m2). - in: wikipedia