I noticed that most of the reviews of this site treat it as a Civil War prison camp that BTW has a POW museum. That's not surprising since most people probably came here because they had learned about Andersonville in school or had seen the play about it. But that does a disservice to an excellent museum that chronicles the history of US POWs in wars dating back to the Revolution. Rarely does one consider that POWs share a common bond regardless of the war they fought in. The psychological aspects of being a prisoner don't change.
Furthermore, the site is also an operational national cemetery and is the final resting place of hundreds of soldiers and their spouses from more modern times. On any given day military burial services may be ongoing.
At first the juxtaposition of the Andersonville and POW themes might seem odd, but the planners of the site realized that most POWs experience the same hardships as did the troops at Andersonville although the circumstances of their confinement were different. Therefore, it seemed only natural to explain the Andersonville story in the context of stories told by other American POWs from other wars.
Many of the stories aren't pretty but they tell of courage and of an unwavering determination to fight back. Some of the museum's exhibits will not be suitable for children under the age of ~8-10, but the overall Andersonville experience can be achieved without exposing young children to some of the darker aspects. In fact, the newly revised Junior Ranger booklet explains the basic story using primarily the outdoor displays of the prison and only a limited visit to the museum's exhibits.
There are two excellent videos, one on Andersonville and one on the POW experience that you can use to begin your visit. Together they take an hour and are shown alternately. After that introduction you can either focus on the outside tour of the prison or on the museum, which contains both Andersonville and POW artifacts. Ranger tours of the prison area are given several times a day and last about an hour. Audio CDs can be borrowed for free which provide half hour automobile tours of both the prison grounds and the cemetery.
Between the videos, the museum and either a car or ranger tour you can easily spend half a day or more. No food is sold on the site and there isn't much nearby, so packing a lunch might be worthwhile.