ANDRIA HALL, CNN ANCHOR: Archaeologists working in Mexico have uncovered a find which could cast light on the mysterious Pre- Columbian civilization. At the site in central Mexico, an international team found 17 human skulls deep inside a place called the Pyramid of the Moon. The location is considered Mexico's biggest ceremonial center of ancient times, and the skulls may be from victims of religious sacrifices. Glen Van Zutpin reports.</s>GLEN VAN ZUTPIN, CNN CORRESPONDENT (voice-over): The Pyramid of the Moon has long been a place of mystery for academics and tourists. Rising at the upper end of the so-called "Avenue of the Dead," it's about 50 kilometers from Mexico City. Very little is known about the culture and political organization of this city, perhaps 100,000 people that thrived between the first and third centuries A.D. But now, the discovery of 2,000-year-old human skulls is giving a clue as to what the large ceremonial center was used for. The 17 skulls were found by a joint team of archaeologists from National Institute of History in Mexico, University of the Americas, National Autonomous University, University of Tokyo and Arizona State University. It's thought the skulls are from an early phase of sacrificial ritual.</s>RUBEN CABRERA, SITE CO-CURATOR: This latest offering is made of 17 human skulls. As they had the first cervical vertebrae stuck to them, anthropologists believe these people were decapitated, because if we had found just the skulls they could have been put there. But the fact that the vertebrae was there shows it had been supported by the flesh.</s>VAN ZUTPIN: While the age or the gender isn't yet known, the discovery seems to prove the sacrifices were carried out in Teotihuacan. It's not known who or what was the object of the ceremony, but most experts think they were related to water and the cosmos. Some say they could have been offered to the construction of the pyramid or to the god or goddess presiding over it. The researchers have enough money to last them throughout next summer. They hope to unearth more answers by then. Glen Van Zutpin, CNN.
Archaeologists Make Mysterious Find at Mexico's Pyramid of the Moon