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10 of the world's most wondrous natural arches

May 15, 2014, 10:12 a.m.
Delicate Arch

Photo: Doug Meek/Shutterstock

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Delicate Arch, United States

The most famous arch in Arches National Park, Utah, Delicate Arch hangs tenuously over the sweeping landscape. Formed of sandstone gradually worn away by weathering and erosion, it appears like a keyhole to an ancient era.