Subterranean river found beneath Chichen Itza

Chichen ItzaThe Guardian – Experts have discovered that the main pyramid at Mexico’s Mayan ruins of Chichen Itza was at least partially built atop a subterranean river. National Autonomous University scientists say they found a subterranean cavity about 20 metres deep below the pyramid of Kukulkan, also known as El Castillo.

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