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How can this be?
Simple - the Great Wall of China is not 13,500 miles long. It’s way less than half that length.
An archaeological survey found that the entire wall with all of its branches measure out to be 21,196 km (13,171 mi).
The Great Wall of China is several dozen walls, built over a period of thousands of years, so the total length might be any number. Same for its age.
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