Blison

in this map. Kitchen has one to access all floors of the main building. Also there are stairs by the Flak, leading you up to the archive floor. The bombed part of the south wing can be used to access all floors (and also the roof).
The map plays something like Omaha Beach, there are two targets - one of them inside. The loadscreen provides you with the location and also images of the objectives. There are a lot of stairs