Operation Carthage:
The Bombing of the Shellhouse (Gestapo Headquarters) in Copenhagen March 21, 1945.
The Shellhus, or in English the Shell-building, was (and still is) situated near the centre of Copenhagen, 500 metres west of the Town hall. It is on the north side of Kampmandsgade between Nyrupsgade and Vester Farimagsgade (see map at right).Since the spring of 1944 the German secret police (Gestapo) had used it as headquarters. In the fall of 1944 several cells were established on the top floor to minimize transportation of prisoners from Vestre faengsel (a large prison in Copenhagen) to interrogation and torture in the Shellhus.

Shellhuset, circa 1940
http://www.freerepublic.com/focus/f-vetscor/1050213/posts