First - Chandeliers
When I release the chandeliers, and wait a few minutes, they do this.
Second - Light Rig
On top of the lights are a few boxes, aligned up the railing. You can walk up the boxes like steps, and jump off.
Third - Basement
I don't have any image for this.
When you spawn near the entrance to the palace, you can take a right turn, and jump over the fence. From there, you just continue straight ahead till you reach the "Exit" door.
Now here's the problem, if I open the door with a crowbar, it will continuously make loud cracking noises. It's the only door that makes these sounds, at least from what I've experienced.