UNESCO - #DYK the Great Wall of China stretches more than 20,000km? It was built from the 3rd century BC to the 17th century AD. To walk the entire length, one must
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![China built a big, beautiful wall, too. It failed [Opinion]](https://s.hdnux.com/photos/01/00/10/06/16810424/3/1200x0.jpg "China built a big, beautiful wall, too. It failed [Opinion]")
China built a big, beautiful wall, too. It failed [Opinion]
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