Kreuzberg, south of Berlin-Mitte, was one of the best-known boroughs of Berlin, famous for its nightlife and its left-leaning electorate as well as its problems with crime the drug scene and a very high number of immigrants.
Kreuzberg consists of two different parts, the southeastern 'SO 36' (or simply '36') part and the southwest 'SW 61' (or simply '61'). Until the Berlin Wall fell, these were the last two numbers of the postal codes for the two areas.