I was in Philadelphia for a business conference the first full week in October. I arrived as early as possible on Sunday and had a few hours of daylight in which to see as much as I could. I managed to visit Independence Hall and see the Liberty Bell. Here are a few highlights.
Should you find yourself in Philly, I highly recommend these historic sites. The National Park Service provides information on operating hours and things to see and do. If you plan to visit Independence Hall, you will need tickets. They are free but you have to reserve them.