Okay, so it might not be THE Castle Wolfenstein, but it's a castle in Activision's upcoming Wolfenstein game, so we're running with it.
Wolfenstein is, of course, another prequel to the game that started it all, Wolfenstein 3D. It may seem funny, this game being set before that relatively primitive example of 3D technology, but when you think about it it makes sense. Towards the end of World War 2, Germany had all but depleted their supply of polygons, and had to revert to pixels. True story.