I'm in Philadelphia for a conference, and I found a delightful detail about the city that I'd like to share. I was wandering around the city last night when I discovered that some of the alleys were actually streets with houses, garages, and even yards (few and small).
All of the streets were barely 1 car wide and I'm pretty sure some were too narrow for cars, but they were a lot of fun to walk through.
The images are all 1MB to 2MB, so I posted them on Flickr. I wanted to post the originals, not trimmed down ones, and I can appreciate the bandwidth issues some will have.
P.S. if you're planning a trip to Philly and want to see these roads for yourself, get on Google Earth. Look at the area in Philly that is south of Jefferson Medical College. Look for the roads that don't have street view available; the reason there's no street view is that the road is too narrow. Those are some of the ones you want.