Navajo National Monument is located within the northwest portion of the Navajo Reservation in northern Arizona.
It preserves three of the most intact cliff dwellings of the ancestral puebloan people (Hisatsinom) - the Keet Seel, Betatakin and the Inscription House site.
The Navajo people who live here today call these ancient ones Anasazi.
Betatakin was built in an enormous alcove measuring 452 feet high and 370 feet across between 1267 and 1286.
It contained about 120 rooms at the time of abandonment. Today only about 80 rooms remain, due to rock falls inside the alcove.
During its two-decade heyday, a maximum population of about 125 people has been estimated.