Keet Seel Ruins, Arizona

Also known as Keet Siel, Kiet Siel, or in Navajo Kits'iil, the site's name means "shattered or broken house." This was the first of three archaeological sites discovered within Keet Seel Canyon, which is now a part of the Navajo National Monument. It is estimated that the original site flourished between 1274 and 1286. Because of its age and fragility, tourism to the site is strictly limited. The site is also listed on the National Register of Historic Places.