So I was thinking since I found I little secret on Zombies Maybe other people know about anything.
I was playing Bus Depot with the gamemode Zenzit, I was driving the bus so I was like lets jump out.
Then I came to a corn field or something, there I found the first map for World At War Zombies. Want to make a video but got a crappy pc atm so.

How to get there:

1. Get on the Bus
2. When you come half too stop 4 you jump off(its a damaged car where the entrance is)
3. run into the corn field I think I was running straight forward(remember to knife the jump monsters that jumo on you)
4. There you go : )