ARCHAEOLOGICAL SITE, MEXICO Monte Albán, site of ruins of an ancient centre of Zapotec and Mixtec culture, located in what is now Oaxaca state, Mexico. The initial construction at the site has been placed at circa 8th century BCE. It contains great plazas, truncated pyramids, a court for playing the ball game tlachtli, underground passageways, and about 170 tombs, the most elaborate yet uncovered in the Americas. The site is located on high ground, probably chosen for its defensibility. The great plaza atop the highest hill is flanked by four platforms; two temples stand on the platform to the south.