Image: Visitors look on at the archaeological area of the Quetzalcoatl Temple near the Pyramid of the Sun at the Teotihuacan  archaeological site, about 60 km (37 miles) north of Mexico City
Henry Romero / Reuters   |  April 23, 2013

Robot discovers ancient chambers in Mexico

Researchers lowered a robot with a camera into a tunnel under Mexico's Teotihuacan and have discovered three ancient chambers under the pyramid.'s Dara Brown reports.

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