Without going into the dream that inspired it, I want to have a basement or at least a low level room/area that is only accessible by a staircase that is on a third or second story.  The ides is to have a normal stairwell where staircases are stacked on top of each other, but it skips a floor, and then the stairs go the opposite direction on that lower level.  I’ll probably need to mock up a 3D model or something if you can’t understand that.  That area would come in handy if you were being invaded by robbers, they’d expect the basement to only be accessible by the 1st floor, or by going down, but you have to go up to go down…