Archaeologists excavate the burial of twelve post-classic, human skeletons in San Andres Cholula, near Mexico City December 29, 2012. Researchers from Mexico's National Institute of Anthropology and History (INAH) uncovered the remains of children and adults, believed to have been buried about 800 years ago, after the site was discovered during the installation of a new drainage system, according to local media. REUTERS/Imelda Medina (MEXICO - Tags: SOCIETY)