Wonders at the top, both from the world of the middle ages and the modern world. Also called "ten thousand Li wall", built in the reign of God, Si Qin Huang. In order to prevent invasions from northern tribes, and the creation of more extended arrives in Ming dynasty. From a survey in the year 2012, it was found that the walls and the different branch lengths together nearly 22000 km, most of the tourists visit the great wall of China at Beijing.
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