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10 of the world's most wondrous natural arches

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

Photo: Jason Hickey/Wikimedia Commons

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Rainbow Bridge, United States

Rainbow Bridge in Utah is often described as one of the world's largest known natural bridges. It's difficult to imagine just how impressive this structure is without standing beneath it. More than 290 feet tall and nearly 275 feet across, it straddles a feeder canyon to the mighty Colorado River, improbably unbroken through time.