Pittsburgh is the city of bridges. If you've every tried to drive in pittsburgh and are not VERY well informed, you'll end up across a river on a one way bridge and will have to find a different bridge to get back downtown. Im not tech savy in the least, but there are some interesting renditions and pictures of Pittsburgh here
http://www.mapsofpa.com/pitts/1980pittposter.jpg that, with the right imagination, could make a pretty interesting CC game.