Visitors to the cave can hike in on their own via the natural entrance or take an elevator from the visitor center.

The park entrance is located on US Highway 62/180, approximately 18 miles (29 km) southwest of Carlsbad, New Mexico. Carlsbad Caverns National Park participates in the Junior Ranger Program. The park has two entries on the National Register of Historic Places: The Caverns Historic District and the Rattlesnake Springs Historic District.[4]Approximately two thirds of the park has been set aside as a wilderness area, helping to ensure no future changes will be made to the habitat.

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

The Chihuahuan Desert, studded with spiky plants and lizards, offers little hint that what Will Rogers called the “Grand Canyon with a roof on it” waits underground. Yet, at this desert's northern reaches, underneath the Guadalupe Mountains, lies one of the deepest, largest, and most ornate caverns ever found.

Water molded this underworld four to six million years ago. Some 250 million years ago, the region lay underneath the inland arm of an ancient sea. Near the shore grew a limestone reef. By the time the sea withdrew, the reef stood hundreds of feet high, later to be buried under thousands of feet of soil. Some 15 to 20 million years ago, the ground uplifted. Naturally occurring sulfuric acid seeped into cracks in the limestone, gradually enlarging them to form a honeycomb of chambers. Millions of years passed before the cave decoration began. Then, drop by drop, limestone-laden moisture built an extraordinary variety of glistening formations—some six stories tall; others tiny and delicate.

Cave scientists have explored more than 30 miles (48 kilometers) of passageways of the main cavern of Carlsbad, and investigation continues. Visitors may tour three of these miles (five kilometers) on a paved trail. Slaughter Canyon Cave provides the hardy an opportunity to play cover, albeit with a guide. The park has more than a hundred other caves open primarily to specialists.

 

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