Centuries Before China's 'Great Wall,' There Was Another

Archaeologists are now mapping a wall in eastern China that is as much as 15 feet tall in some places, and predates the more famous barrier by 300 years. Hundreds of miles long, it was likely erected to keep neighboring Chinese dynasties from invading each other, historians say.

Source: http://www.npr.org/2013/12/29/255550362/centuries-before-chinas-great-wall-there-was-another?ft=1&f=1007

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