The gates of Mos Espa; the Pod-racing arena; the gallery and the Mos Espa streets with Watto”s shop are all there.
A great article detailing each location and with tons of photographs on http://www.losapos.com/starwarstunisia
Links to the Star Wars set photographs here: http://www.panoramio.com/photo/7927342v
“Star Wars” was born a long time ago, but not all that far, far away. In 1972, filmmakers George Lucas and Gary Kurtz were toiling on “American Graffiti” in their San Rafael office when they began daydreaming about a throwback sci-fi adventure that channeled the old “Flash Gordon” serials as opposed to the bleak “message” movies that had taken over the genre. A Great Article from the LATimes
http://www.theforce.net/jedicouncil/interview/dak.asp 
We then asked him about what it was like filming The Empire Strikes Back. “I think first of all very definitely that film had a different morale than any of the other pictures that I worked on. I think thats a tribute to Lucas and Gary Kurtz. They were very sensitive men, very ethical.”