The Tucson Citizen, along with R. Brooks Jeffery of the University of Arizona, has put together a list of Tucson eateries with long and interesting architectural histories (you may or may not have to register with the site, for free, to view the article). Included on the list are El Charro (pictured above), built in 1900 by French stonemason Jules Flin, and Pat's Drive-In (both reviewed on this site by Michael Stern). The oldest building, housing La Cocina Restaurant & Cantina, was built in the 1850's.