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10 of the world's most wondrous natural arches

By: Bryan Nelson on May 15, 2014, 10:12 a.m.
Immortal Bridge

Photo: Wikimedia Commons

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Immortal Bridge, China

This precarious rock bridge found on Mount Tai, a tilted fault-block mountain, is counterintuitively called the Immortal Bridge, though you probably wouldn't want to test your own mortality by crossing it.