​Chichén Itzá, one of best known archaeological sites of the Maya civilization, has a split personality. The site is located in the northern Yucatan peninsula of Mexico, about 90 miles from the coast. The south half of the site, called Old Chichén, was constructed beginning about 700 AD, by Maya emigres from the Puuc region of southern Yucatan. The Itza built temples and palaces at Chichén Itzá including the Red House (Casa Colorada) and the Nunnery (Casa de las Monejas). The Toltec component of Chichén Itzá arrived from Tula and their influence can be seen in the the Osario (the High Priest's Grave), and the Eagle and Jaguar Platforms. Most interestingly, a cosmopolitan blending of the two created the Observatory (the Caracol) and the Temple of the Warriors (K. Kris Hirst).​

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http://archaeology.about.com/od/archaeologic7/ig/Chichen-Itza/​