On accident I stumbled across a Wolfenstein room. Here is how I found it and where. After I got put in the kill room in ghost hideout I found it. Just after that go kill your first wave of enemies on the second floor. I saw a flat screen tv and to the right is a secret door. I am always pressing x(ps3) interact button so I don't miss any loot. So I was pressing it on the blue Wolfenstein door and it opened. It didn't prompt me to do so it just did it. Inside is a wolf statue thing. Pretty cool for Wolfenstein fans and it's worth 150 bucks. I told my friend about it so he went back to find it and couldn't open the door. I'm thinking you have to do it on first playthrough.