Image: A tunnel is seen after an excavation in the archaeological area of the Templo Serpiente Emplumada at the Teotihuacan archaeological site
Henry Romero / Reuters

TODAY   |  August 04, 2010

Ancient tunnel may reveal tombs

A tunnel is discovered beneath temple ruins in Teotihuacan, Mexico, that experts believe lead to tombs and an underground city dating back to 100 B.C.'s Dara Brown reports.

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