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10 of the world's most wondrous natural arches

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

Photo: daveynin/Flickr

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Landscape Arch, United States

Arches National Park in Utah hosts one of the largest concentrations of natural arches in the world, and the longest arch in the park is Landscape Arch. Spanning over 290 feet, the arch hangs precariously like an aging picture frame.