Sanctum

The area that contains the lever to the The Antechamber. I need to find 8 keys.

What could the locations be?

1. room 46
2. Vault
3. A clocktower of some sort? Or Observatory?
4. Under the water Underground. Need a Pump Room and maybe Boiler Room for this one?
5. Drawing Room? Or somewhere else with a throne. The message in the Rumpus Room seems to support this.
6. Do we have a train station or smt?
7. If you draft it quite late? Maybe I need the rewind item from the Showroom? Or maybe the Music Room.

Keys Found:

• One was in a safe in the Vault
• Another was in room 46.