You can do it! Take the SEPTA train from the airport to the Market East station, which is in center city Philly. You will be underground, so the key is to find your way up to street level. That will be around 12th and Market streets, and all you have to do is walk or take a cab to 6th & Chestnut streets (8 blocks). You can see the Liberty Bell and Independence Hall where the constitution was signed since they are right across the street from each other. Then get your butt back down to the airport ASAP! Remember to pay tribute to Willy Penn on the top of City Hall!! Just promise Betsy Ross and Ben Franklin you will pay tribute to them next time.