Malta’s Azure Window. Aruba’s Natural Bridge. New Hampshire’s Old Man of the Mountain. Four of Australia’s Twelve Apostles. All were beautiful, quirky sites carved by the forces of nature, and all were destroyed by the very same forces. If you are fortunate enough to have seen them before their demise, you undoubtedly have a fond memory; if not, you’re out of luck—they’re gone for good. But fear not: Plenty of other one-off oddities still exist around the world. You just have to make sure you get to them before storms and erosion make them things of the past. Read more about the world’s top five natural curiosities >