I have an ancestor that died at Andersonville Prison so I stopped there on my way back from Florida.
I found my ancestors grave. He was with the 22nd Indiana for three years, then was captured at Peachtree Creek near Atlanta. He lasted three months before he died from a disease caused by the unsanitary conditions. If you go there, take a tour with a Park Ranger. They are free, and interesting. Our Ranger was a former Marine from Americus, GA. A very nice person. They have a really nice POW display there also that takes a while to get through. There are a lot of artifacts.
If you are ever near there, it's worth the stop.