When Becky was visiting, we hit up a lot of historical sites. One of the more random was Elfreth's Alley. It's the oldest continuously inhabited street in the US or something like that. Basically, it's just a really cute pedestrian street (where people still live).
A lot of Old City looks like this. It's really quite beautiful to walk around. When you visit, you shall see. :)
(thank you for the picnik suggestion! doesn't the spacing look so much better on this collage?)