I noticed that there are two rooms in the game with a king's throne. One of them is nice and shiny and the other one is old. Easy of them has a code in front of the seat that you can see only when you use the 3D view (game+).
First room location on the map:
Second room location on the map:
Any ideas where to use these codes? I tried using them in the rooms I found them in (also vice versa), but nothing happened.
(system won't let me to post more than two links, I will add more images once I can post them).