Acoma Pueblo Mud Oven

Note how beautifully the oven integrates with the building.
http://www.smu.edu/isem/Hummingbird/July22/july22.html

The photo that shows the oven door is from:
http://travel.webshots.com/photo/1498197544077997123EcPCFA

Navajo bread oven
cfannewmexico.org/navajo.htm

Not sure where these hornos are from