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The Great Wall of China
The world’s largest man-made structure, a mighty fortification built to protect a kingdom and a bucket list destination for travelers across the globe, has survived for over 2,000 years, but its legacy may be nearing an end. A third of the wall has been reduced to ruins, eroded from over-farming, looting of bricks, and inevitable old age. The best-preserved section, erected in stages during 14th through 17th centuries under the Ming Dynasty, still stands—but how long before it too gives in to the test of time?
