Mummy Cave Ruin - The Navajo traditional Navajo name is Tseyaa Kini, which means "House Under the Rock".

The discovery of two well-preserved mummies led the members of an 1880 archeological expedition to call this site Mummy Cave.  Mummy Cave is located in Canyon Del Muerto, inside Canyon De Chelly National Monument. The site was inhabited for about a thousand years beginning in 300 AD.  At about 1296 AD the Anasazi from Mesa Verde may have moved here and constructed the main tower as determined from the architecture. The cliff walls are about 700 feet at this site.