From Monona, proceed east on US18 about .5 mile east of the junction with US52 to Spook Cave Road, and follow that road north to the campground. The store is two schools attached, one perpendicular to the other. The sales person said one school came from nearby while the other came from several miles away, and they were moved to this location about 1955. It appears that the end of the school on the right side in the photo below is actually the front, since it looks like a central door with windows on each side. It also appears as if that roof has been lowered to better join the other building.
This next photo is slightly blurred - I really need to watch that auto-focus! It is as you walk in the door, looking to the back of the first school. you can see where the chimney was, and there is the dais for the teacher's desk. Another door has been cut into the side. Also, as you walk in the door, you can easily see on the floor where a wall was removed; it was the small coat room between the front door and the class room, and had a door on each side.
This shot is looking into the other school where the gift shop is located.