Evidently, the sets built for the original Star Wars famed Tatooine location were simply abandoned.
Beautiful to look at, impressive in how well they've held up and are instantly recognizable; these well-built shelters appear to have attracted quite an interesting slice of Tunisian culture to move on in. I'm sure there must be a great story that went into their design and build.
Rocketnews24's youtube channel contains several more amazing segments. (Thanks, Eric Weiss!)