In a part of Belgrade called Autokomanda, the Nazis set up in August 1941, a temporary collection camp in a former armory for Serbian Jews and gypsies. The camp was liquidated in December same year because the Nazis established more suitable places and moved the prisoners to other camps in Serbia, including Sajmiste in Belgrade. In autumn 1941, however, Jews were regularly picked up from the camp to be killed, for instance at Jajinci south of Belgrade.
Current status: Demolished with monument (2009).
Location: 44°47'16.27" N 20°28'07.01" E
Get there: Car.
Follow up in books: Pavlowitch, Steven: Hitler’s New Disorder: The Second World War in Yugoslavia (2008).
There are many old houses nearby, but to what extent some of these were part of the camp I do not know, but probably some.