Pyrmaid at Teotihuacan, Mexico.
Pyrmaid at Teotihuacan, Mexico.

The pyramids of Teotihuacán, northeast of Mexico City, draw tourists in their thousands each year, even though little has been known about the ancient civilisation that built them - until now. Archaeologists have discovered a large amount of mercury under one of the pyramids, along with several artifacts, that could shed light on one of the Americas’ greatest cultures. Read more: theguardian.com

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