Grünewald Bahnhof
Grünewald railway station was one of three stations in Berlin from which the Jews of Berlin were deported to ghettos, labor camps or extermination camps in Eastern Europe (the other two were the Anhalter Bahnhof and the Güterbahnhof Moabit). Between October 1941 and February 1945, about 50,000 Jews were deported from platform 17 at Grünewald.
Current status: Preserved with monument (2008).
Address: Am Bahnhof Grünewald 14193 Berlin.
Get there: Commuter train to Grünewald Station.
Follow up in books: Gilbert, Martin: The Holocaust: A History of the Jews of Europe During the Second World War (1987).
It is really atmospheric to walk on the platform and read about the different deportations and destinations.