Possible Teotihuacan royal tomb

Mexican archaeologists find 1,800-year-old tunnel, possible tombs under Teotihuacan ruins

A long-sealed tunnel has been found under the ruins of Teotihuacan and chambers that seem to branch off it may hold the tombs of some of the ancient city's early rulers, archaeologists said Tuesday.

Experts say a tomb discovery would be significant because the social structure of Teotihuacan remains a mystery after nearly 100 years of archaeological exploration at the site, which is best known for the towering Pyramids of the Moon and the Sun.