Great wall of China has been building for protection from invasion of the tribes in the north. Originally, in the days of the Qin Dynasty, and the Han Dynasty. A small wall many. One, which link together then.5 continue until completed in the 16 in the Ming Dynasty. At present, with a length of 6400 kilometers by extending from Shanhaiguan, east to end at Jiayuguan West and has been registered as a UNESCO World Heritage Site
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