Secret chamber may solve Mexican pyramid mystery - Teotihuacan

At the end of this month, they are to investigate a man-made tunnel and cave system underneath the pyramid – the third biggest in the world – to test theories that it was used for rituals including human sacrifice.

“We think it had a ritual purpose. Offerings were placed at the very end of the tunnel as part of the pyramid’s construction process,” said Alejandro Sarabia, Teotihuacan’s director of archaeology. “*

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