var items = new Array (new ImageMetaData('Some of the five skulls discovered are seen in the "Plaza de las Tres Culturas", or the plaza of the three cultures, in the central Tlatelolco area of Mexico City December 27, 2007. A team of researchers from the National Institute of Anthropology and History (INAH) discovered an 800 year-old pyramid in the main temple of the religious and political centre of Tlatelolco, known to have been inhabited by the Mexicas, the Aztec\'s most powerful group. They also found, a few metres from the pyramid, a living complex in the city and the five skulls dating back to the year 1431.  REUTERS/Henry Romero (MEXICO)','http://msnbcmedia.msn.com/i/msnbc/Components/Photo_StoryLevel/071227/071227-pyramid-Mexico-hmed-7p.jpg','9:43 p.m. ET, 12/27/07','Henry Romero / Reuters','REUTERS',22413539));