#20 Nowhere to go
Such a beautiful staircase with no reason or purpose whatsoever.
Maybe this is like platform nine and three-quarters from Harry Potter, and the staircase probably leads to the magical world of Cinderella. A new, magical world exists right across that wall.
If one wants to enter it, the only method is to run through the wall. If you fail, then make sure to keep your friend on alert so he can call the ambulance.