The Northern Line of the Great Wall of China has recently been mapped using drones and high-resolution satellite images. The 460-mile-long Northern Line mostly winds through Mongolia, and was constructed of pounded earth between the 1000s and 1200s CE.
The Northern Line was previously thought to have been constructed to prevent incursions by nomadic tribes such as those eventually united under Genghis Khan. But the team found that much of this section of the more than 13,000-mile-long Great Wall is low in height and placed near paths. In other words, it does not match what you would expect for a wall intended to prevent enemy invasion. It looks more like a wall intended to monitor the movement of livestock and people – and potentially tax them.
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