Keet Seel in Navajo National Monument, Arizona

“This is a backpack to one of the largest and best-preserved cliff houses in  Arizona. This trail takes you to the 160-room Keet Seel, tucked under a huge  overhang in a remote canyon. People of the Anasazi culture lived for more than a  thousand years in the Four Corners region, the area where Utah, Colorado, New  Mexico, and Arizona.”