Did you see the “DejaVu” Movie with Denzel Washington, where they took photo- and videodata to construct a complete 3d view of a crime scene? Sounds like Sci-Fi? Then check out the demo of the photosynth-technology. They scan photos from any given database (e.g. Flickr) and ananlyze them for similarities to construct 3d models of any given space.

You can even test the application live on the web here.