April 5, 2013

Arches National Park, Utah

Photograph by Raul Touzon, National Geographic

Most of the arches, spires, and pinnacles in Utah's Arches National Park are made of soft red sandstone deposited 150 million years ago. In addition to formations like the Courthouse Towers, pictured here, the park is home to more than 2,000 natural arches—the greatest concentration in the U.S.

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