A secret passage to the underworld may have just been discovered, at least according to the mysterious ancient civilization that built it. Archaeologists have confirmed the existence of a hidden tunnel leading to a chamber deep underneath the Pyramid of the Moon, the massive temple located in the ancient city of Teotihuacán, near what is now Mexico City.
00:39 The city of Teotihuacán
02:53 The Pyramid of the Moon
04:34 Underground tunnels at Teotihuacán
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