I was exploring some parts of Germany from my trip, when I came across this in Berlin.... The whole building is blurred out in Street view, no matter where you click. So it's definitely not a bug.
http://goo.gl/maps/EmH1y
I know Google Maps has a few things censored, so is this yet another? Or what is it?

EDIT: Just realized it's (at least partially) the Checkpoint Charlie museum. I wonder why we're not allowed to see it?