The architecture and iconography of Xochicalco show affinities with Teotihuacan, the Maya area, and the Matlatzinca culture of the Toluca Valley. Today some residents of the nearby village of Cuentepec speak Nahuatl.
The main ceremonial center is atop an artificially leveled hill, with remains of residential structures, mostly unexcavated, on long terraces covering the slopes. The site was first occupied by 200 BC, but did not develop into an urban center until the Epiclassic period (A.D. 700 - 900). Nearly all the standing architecture at the site was built at this time. At its peak, the city may have had a population of up to 20,000 people. [Wiki]
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