Experts believe that Sayil, or "place of the red ants," flourished between AD 800 and 1000. It's renowned primarily for its majestic Gran Palacio. Built on a hill, the three-story structure is adorned with decorations of animals and other figures, and contains more than 80 rooms. The structure recalls Palenque in its use of multiple planes, columned porticoes, and sober cornices. Also on the grounds is a stela in the shape of a phallus—an obvious symbol of fertility.