Great Wall of China



This newly elected world wonder was built along China's northern border over many centuries to keep out invading Mongol tribes.

Constructed between the fifth century B.C. and the 16th century, the Great Wall is the world's longest human-made structure, stretching some 4,000 miles (6,400 kilometers). The best known section was built around 200 B.C. by the first emperor of China, Qin Shi Huang Di.


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