Just in case anyone's interested, Jerry Built, a programme by Jonathan Meades, was good and can be obtained. Covered things like the raining dome and such, iirc.
Edit: Actually, no, that was another programme on relatively recently about Speer himself. By... a bloke whose name escapes me. Famous enough, though, and someone else should know what I'm on about. Did another on Gaudi in the same series, if that's any help.