The New Seven Wonders of the World

great wall seven wonders
Raymond K. Gehman / National Geographic / Getty

Great Wall; China
The largest man—made 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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