The Berlin wall (e.g. near Ostbahnhof and Nordbahnhof) is a must see for visitors who want to get an impression of the life in the GDR. At Gesundbrunnen Center you can get a feeling for the Berlin Underground world in “Berliner Unterwelten”. And I recommend the best curry sausage in Berlin at curry snack bar Konopke.
Ruschestraße 103, Berlin, 10367
The last Minister of the GDR, Erich Mielke, controlled the Ministry of State Security from the Stasi Museum Berlin until 1989. After the complex was stormed, the rooms on the Minister's floor were sealed and maintained in their original condition