These are probably the chairs that Edward, Bella, and Alice are waiting in while they can't leave until dark. Very cool. Can you picture Bella on Edward's lap in on the the slots?
Possible drain h*** that they go down to get to the Volturi meeting place. Not exactly as I pictured. It looks too new and too obvious. I was looking for something flat, very old looking, and not something humans would think to go down.
Here is a statue of a vampire with chains holding it down. It's wearing a black robe with gargoyles surrounding. Notice the long poles for people to carry around the courtyard. Pretty cool Mister Weitz!!!