Let's Go to Philly.Right Now.
You know Second-life? That program that you download and register, create your own avatar and then wonder around a virtual city, buying property, flirting with other online peoples...just general everyday life but you are sitting on a computer somewhere in the world.

Well GeoSimPHILLY is very close to that, and probably better, it's like Simcity with a real city. It's the same rules as above but you are interacting within a city modeled on a real city. There are tours and interactive things that reflect the real city. You can learn more about the planning of the city, see some sights that you missed on your last trip there and possibly even buy things that you forgot to get.

Link: GeoSimPHILLY