The new insight, published in the December issue of the journal Antiquity, came because two archaeologists decided to use a decidedly low-tech method to understand the sand drawing's ancient secrets: by walking it.

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The Nazca Lines have been a mystery since they were first discovered in the 1920s by Peruvian archaeologist Toribio Mejía Xesspe. Long-forgotten people from the Nasca culture created the drawings between 200 B.C. and A.D. 500 by brushing away the dark top layer of barren de...
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