The New Seven Wonders of the World
Raymond K. Gehman / National Geographic / Getty
Great Wall; China
The largest manmade monument ever built at about 4,000 miles in length, the wall was originally built to help create a united defense system and prevent invading Mongol tribes out of China. Construction began around the 8th century B.C. and efforts to revive it took place from 1368 1644 A.D.
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