Andersonville

Andersonville was one of the many Confederate prison camps which made life absolutely horrible for Union prisoners during the civil war. Andersonville, located in central Georgia, was the worst of them all, and it is widely regarded to be the model which the Nazis used to create death camps such as Auschwitz and Bergen-Belsen. In Andersonville, prisoners would huddle together in their makeshift huts known as Shebangs, which were made out of anything and everything that they could get. Rations were handed out once per day, often stale bread, and this was the only thing that the men could look forwards to. When someone died, the body was hauled away on the dead wagon, which also came back at night to deliver rations. Of the 45,000 people in the camp, 13,000 died of infection, disease, or exposure. The camp itself was only designed to hold a mere 10,000 people. The chance of escape was slim to none, and sentry posts, or pigeon roosts, sat at every 90 feet, and there was no way to find a way to safety if you did get out of the tall, pine wood walls. The pond which was used to get water to the prisoners was polluted with waste, and was undrinkable for the most part. The event that led up the Andersonville was the overlfow of Union prisoners, and it led to Henry Wirz, the warden, being the only person to be hanged due to war crimes in the whole civil war. 

en.wikipedia.org
http://www.civilwar.org/education/history/warfare-and-logistics/warfare/andersonville.html