One of the most recent discoveries was an underground canal beneath the pyramid. It's thought the waterway, discovered using sonar technology, may have been built before the temple and the pyramid was purposefully constructed on top, to give Pakal's spirit a path to the afterlife. The site in Palenque features an array of ruined temples spread across a palatial complex. Alongside Tikal and Calakmul, it represents one of the most powerful Mayan cities in history.

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