A new archaeological study, which started in 2007 and took five years to complete, has measured the Great Wall of China at 21,196.18km long - that is well over twice as long as the previous mark of 8,850km.
It seems the discrepancy in the original distance is down to the fact the previous mark of 8,850km was largely based on historical records.
The Great Wall was originally built more than 2,200 years ago to protect China's north border from foreign invaders.
The Great Wall of China is an important landmark in China. Know more about Asian Landmarks at http://www.studychamps.com/interactive/Asian-Landmarks.swf
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