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10 of the world's most wondrous natural arches

By: Bryan Nelson on May 15, 2014, 10:12 a.m.
The Azure Window

Photo: Rob WIlson/Shutterstock

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The Azure Window, Malta

This limestone sea arch on the Maltese island of Gozo is a popular spot for scuba divers, but it is also potentially perilous. Like all natural arches, the Azure Window has a lifespan, and erosion rates suggest this arch could collapse completely within just a few years. You wouldn't want to be swimming beneath it when that happens.