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Huairou, China
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This construction measures a whopping 21,196 km in its entirety. Can you name the famous fortification?
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Some think it can be seen from space. How well do you know the story behind the longest wall in the world?
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© superjoseph / iStock / Getty Images Plus 2020-11-17 12:54:24 :
2020-11-22 20:28:25 : spain