<p>More than a thousand years old, the pyramid known as El Castillo towers over the ancient Maya city of Chichen Itza in southern Mexico.</p>

More than a thousand years old, the pyramid known as El Castillo towers over the ancient Maya city of Chichen Itza in southern Mexico.

Photograph by Chris Millbern

Archaeologists Search Ancient Pyramid for Clues to Maya Underworld

Archaeologists deploy innovative technology to discover what lies within and below ancient Maya ruins.

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