It's the overlook. Took us a long time and 100s of photos until we figured it out. Its the back entrance of the hotel. The best photo that we could find of it was this cookie model. The wideness of the doorway and the pillar almost is identical to it.
That screenshot that I posted is part of a drive-by video.... Trust me, we got a good look.
It could also be the entrance to the maze
I doubt it though.
What are your theories?