A small, tall room with stairs around the outside, a couple of protected rooms with big weapons (and teleporters as the only entrance), and sniper pillars. Vertical distance is big enough that you actually have to aim.

Modeled after a western town, complete with jail, saloon, bordello, mines, and Boot Hill! A bit linear, but that comes from trying to set it up around Main Street (as most old west towns were), and there are usually multiple ways out of a room.