What are some other interesting US Civil War battlefields or sites (Antietam, I would guess, Fort Sumter?)
Antietam is one - the bloodiest day in American history. Then there's a whole bunch in Virginia: The Wilderness, Spotsylvania, Fredericksburg, Manassas (site of two major battles). Further south, Vicksburg, Shiloh, Chickamauga, Stones River are all major sites. You probably haven't heard about any of these (maybe Manassas), but they're among the biggest battles of the war.
The Virginia sites are all huge, historically speaking. Shiloh is a particularly beautiful battlefield. Vicksburg is the most impressive, because it's one of the few with obvious remains of battle - it was basically a trial run for WWI. Most battlefields have a low line of earthworks and some craters, but it's tough to picture what they looked like.
If I'm going to cite a single thing, it would have to be the Cherokee Declaration of Causes. As a single document providing context around events at the time it's a little mind blowing the first time you read it.
http://cherokee.org/AboutTheNation/History/Events/CherokeeDe...
Basically, the model of the union government's sanctions today.
Wish that perspective was in my primary education. I feel like I only learned about generals and battles.
All the internet debates I saw when the confederate flag came down got me really interested in how so many people could know TOTALLY different things about the most historically significant event in the country.
Now I've got about 12 books covering things in different ways (and there are so many more). Thanks to the Library of Congress and Google's efforts to scan books it's really easy to check citations as you read when you're having those "There is no way that's real" moments followed by "Holy crap! That's real?!?!"
The whole thing has sparked an overzealous interest in history, which is the subject that interested me the least when I was younger. Now I give serious consideration to pursuing a doctorate one day with the aim of being a History professor when I get closer to 50 (which is still a decade or so off).