PA | Visiting Gettysburg
The Gettysburg National Military Park Museum and Visitor Center is where you want to start. The current film - A New Birth of Freedom narrated by Morgan Freeman - is incredible, and the Cyclorama painting is legit. You can find a map for the tour that takes you to all the Gettysburg battle spots (we've always driven). And, if you schedule your visit right, you can see living history program.