I'll mention Philadelphia for the obvious reasons. Valley Forge National Park. Just a little west is Brandywine Battlefield from the same war. While there, go to the Brandywine Museum to see many of the paintings of Andrew Wyeth. Further west, Gettysburg. south of that in MD. Antietam Battlefield. As a pilgramige, I'd suggest upstate central New York for the birthplace of the Women's Rights movement.

I'd also suggest many of the Shaker communities open to the public. There is a nice one in Kentucky.

I highly suggest a visit to ANY of our Native American reservations. Go to learn what we have lived with for many hundreds of years.