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Great wall of china length 20120606

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The Great Wall is much longer than previously thought, but most of it is badly damaged.
Ancient Chinese military structure has washed out near Dajingmen, in Northern China
Great wall of china length 20120606

Tourists climb up a dilapidated section of the Great Wall of China, at Simatai, northeast of Beijing, 1 July 2007. This Ming-dynasty Wall was built as one of four major strategic strongholds for defensive puropses from tribes invading from the north.