While filming Star Wars episode 4 George Lucas went to different places in the world and used some existing architecture. Fans found Skywalker’s childhood home in Tunisia and with permission of the government restored the home. Here is some more information: http://www.msnbc.msn.com/id/26315908/#47807259
Here is the final video by the fan who organized the effort:
Here is the website: http://www.markdermul.be/tatooine/savelars.html
Updated 7/8/2013 Due to wrong video link. Strange how that happened.