This is the Foam Bathroom.  I know, it looks more like a Cardboard Box Room, but it was so named because there is actually a bath in there somewhere, and at one point in its history it was full of foam rubber.

  I challenge anyone to spot the bath, basin and toilet that really are there underneath all this stuff.  I'll give you a clue - they're all a rather nasty '70's colour, the name of which eludes me.