Reading Terminal Market, which is located below what is now the Convention Center. An overwhelming number of food vendors and many of them quite good. The Rodin Museum, which is on the Benjamin Franklin Parkway. The Barnes Museum, also on the Parkway, has what is probably the finest collection of Impressionists and post-Impressionists in the U.S. and an interesting history. Valley Forge is 35 minutes away (except at rush hour) and Washington's Crossing about 1-1/4 hour north on I-95.
Forgot all about the Reading Terminal - you can get real food - raw or prepared - sold to you by real Amish. Speaking of which, if you want to go out into the countryside toward Lancaster, you can see something of their world. It's not like it used to be - a lot of the farms have gone b/c of sprawl and the Amish moved on - but it's still there. Also, come July and August you can get some of the best canteloupes you will ever have from locals out that way. Little honor-system stands at the ends of farm lanes where you can smell the canteloupes as you drive up. There's something about the PA climate that yields fabulous melons and 'lopes.
When you go to Valley Forge - remember that during that winter, that was the second-largest city in America. You can feel the history.
