Originally Posted by
Non-NonRev
From central Berlin, Dachau can be reached via S-Bahn. - it was one of the first camps (1934 if I remember my history correctly), and was used a lot for political prisoners and later POWs (it wasn't one of the mass extermination camps such as Auschwitz-Birkenau, etc). The visitor's center is well-done and informative (I visited in 1994).
I think you mean Sachsenhausen (the camp I mentioned), as Dachau is in south Germany. As you mentioned, Sachsenhausen wasn't used for mass extermination but various extermination techniques were 'tested' there during the course of the war for various reasons.
The confusion might be due to the similar sign on the entrance gate to both Dachau and Sachsenhausen.