I went to Andersonville National Park yesterday. There isn't really much there aside from the museum. Other than the museum there is an open field with some monuments, a few recreations, some of the earthwork defenses remain, but overall it is mostly an open field.
We decided to take a driving tour of the site, so we rented a CD tour. When we went to get it the Park Ranger/cashier didn't want to rent to me because I only had a $20 bill. Why she couldn't give me change I don't know. To top it off I had to leave my driver's license with her for a $1 CD rental. That was astounding.
When we left we saw a sign for the Jimmy Carter National Historic Site just 26 miles down the road, so we went there too. It was kinda interesting that they declared the whole town a historic site. We stopped into the old high school which is now the visitor center.