Betsy Ross and Benjamin franklin homes, and old north church.

Valley Forge Park is NW of town. And definitely have a genuine Philly cheesesteak sandwich. My daughter and I did a cheesesteak challenge trying several recently. We loved an Amish Breakfast in Reading Terminal market, but there's tons of other great unique food options there.

I'd be happy to give you a call if you like. I agree with others on Gettysburg, and inner harbor/Fort McHenry in Baltimore. The Naval Academy is also close by in Annapolis. We lived in the area for 7 years.