Photosynth is a powerful tool for exploring synthetic spaces as well as real ones.
Today's home page update exposes some interesting Photosynths made completely or partially from synthetic imagery. Rendered scenes, video games, and other virtual reality applications have made for some interesting synths that you won't find on any map. Here's another great one:
I hope that people continue exploring virtual worlds, and even hybrid scenes that blend virtual and photographic imagery.
There is a lot of potential in virtual synths that hasn't been explored yet. Show us what's possible.