Andersonville National Historic Site occupies the ground where the Confederate prison Camp Sumter held some 45,000 Union soldiers between February 1864 and May 1865. The 26-acre stockade is gone, but its outline has been reconstructed with corner posts, a stretch of timber wall, and markers showing the infamous deadline — a low rail set 19 feet inside the wall, beyond which any prisoner could be shot without warning.
The site is the only park in the National Park System dedicated to all American prisoners of war throughout the nation's history. A driving loop circles the stockade grounds, with stops at the deadline, the site of the camp gates, the spring that became the prisoners' main water source, and several state monuments. Allow at least three hours; longer if you want to walk the perimeter trail.