I think I've worked it out: Red Star's picture (above) is the site of the current Topography of Terror exhibition hall. The display running parallel to the remains of the Berlin wall was described (on both my 2010 and 2011 visits) as being in the original cellars but closer examination shows that only part of this display is in the original cellars. The section of the display at the corner of Wilhelmstrasse and Niederkirchnerstrasse is in the foundations of a previous(corner) building. I have indicated on the second photo in blue where I think the building stood, i.e. pretty much where Cor's photo indicates but from the other direction. The first photo has a blue arrow indicating where I believe the original Gestapo cellars to have been. Having said that, I am fully prepared to be advised differently.
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