Four rooms on two floors around an open courtyard-like center
under a glass dome (or spire...).

Specials:

Motor driven rotating door (with switch) - you can go through it
while it's running, if you're lucky...;-)

In the center: A huge motor driven fan (with switch) mounted below
the ground, blowing you up the spire to a circular tire shaped
platform with goodies (like rocket launcher and crossbow).

Around the fan place: A "moat" like water barrier. There are two
bridge plates - but they can be pushed or carried way!