Researchers have discovered a Secret Passageway in the Temple of Kukulkan in Mexico's Chichen Itza that could reveal clues about the ancient civilisation's underworld beliefs.
The Kukulkan temple, also known as El Castillo (The Castle), a step pyramid dominating the Chichen Itza
archaeological site is known to be made up of numerous passages and secret sections
[Credit: Cris Bouroncle/AFP/Getty Images]The Great Mayan...
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