Mesa Verde National Park - Cliff Palace
The Cliff Palace is the largest cliff dwelling in North America. The structure built by the Ancient Pueblo Peoples is located in Mesa Verde National Park in their former homeland region. The cliff dwelling and park are in the southwestern corner of Colorado, in the Southwestern United States.
Tree ring dating indicates that construction and refurbishing of Cliff Palace was continuous from c. 1190 CE through c. 1260 CE, although the major portion of the building was done within a twenty-year time span. Cliff Palace was abandoned by 1300, and while debate remains as to the causes of this, some believe a series of megadroughts interrupting food production systems is the main cause.