I would probably want to see the Museum of the American Revolution and Independence Hall in Philadelphia, plus the art museum there (not because of it being in Rocky, lol). No doubt though, I’d be very careful of where I went and when, given the appalling crime problem in that city.
I was in Philly for a few days 20 years ago. The highlight of the trip was going to a place called Moriarty’s and drinking lots of pitchers of Yuengling Lager and eating these enormous chicken wings.