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10 of the world's most wondrous natural arches

By: Bryan Nelson on May 15, 2014, 10:12 a.m.
Green Bridge of Wales

Photo: Tatagatta/Shutterstock

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Green Bridge of Wales, United Kingdom

This impressive natural sea arch is found in the Pembrokeshire Coast National Park in Wales. Today it is one of the more famous landmarks in Wales, but like all arches it will one day collapse into the sea.