Cinderella Castle
http://www.hiddenmickeys.org/WDW/MagicKingdom/Secrets/FL/Castle.html
There is a room upstairs in Cinderella Castle. Actually, it is more like an apartment. Walt was going to use this not as a hotel room but as an apartment for his family. This idea was abandoned with the apartment half finished. Unfortunately, Walt never saw the opening of Walt Disney World and this apartment has never been used.
REPORTED: Mr Kenneth W Miller 06 JUL 95
CONFIRMED: G&L 13 JUL 95
CONFIRMED: Michael Littell 04 OCT 95
CONFIRMED: James T. Horn 28 NOV 95
CONFIRMED: Gene Jackson 31 JAN 96
CONFIRMED: Ann Marie Cummings 28 FEB 96
CONFIRMED: Sean Henderson 26 JUN 96
It is currently used as a dressing room for the female kids of the kingdom. There are no windows in the room.
CONFIRMED: Sorcermic 22 SEP 96
CONFIRMED: Laurie 16 FEB 97
CONFIRMED: Andrew Schub 22 MAY 97
CONFIRMED: Andrew Rossetti 01 SEP 97
CONFIRMED: K. Borgen 02 OCT 97
I've seen pictures of it in The Disney Magazine.
CONFIRMED: Jan 13 APR 98
CONFIRMED: Lisa-Anne Mitrovic 08 JAN 99
Although it may have been his idea, the apartment in the castle was not for Walt. He died in December 1966, well before the ground breaking of the Magic Kingdom (which opened in October 1971). I've heard reports it was for Roy's family, but can't confirm.
UPDATE: David Poole 09 JUL 99
The apartment that had been built for Walt is now used as a dressing room for the people from Entertainment (for example, the "Mayor's" costume is kept there). The stairs outside the castle, on the Fantasyland side go up to the second level. You would end up on next to the windows for Cinderella's Royal Table. There is a walkway that goes all the way around the castle on this level. The stairs do not take you all the way to the top... There are two elevators in the castle (Not including a dumbwaiter). The one in the lobby of the Castle, which only goes up the the second floor (for use by guests to the restaurant) and the one that is for Cast Member's ONLY. This one goes from the tunnels, to the "2nd" floor (the walkway through the Castle, on the opposite side from the mural. There is a locked door in front of it, so guests can't get into it.) and then the upper kitchen of the restaurant, and finally it stops on the floor by the apartment/dressing room. It is a VERY small elevator. Watch the people from entertainment after a show (like Disneymania) and see how hard they have to squeeze to get in there. (Costumed characters enter a dressing room nearby, and get out of costume BEFORE trying to use the elevator.) The restaurant itself has two kitchens. One on the level with the tunnels, where food is mass prepared, and one on the level with the restaurant, where finishing touches are done. The elevators and dumbwaiters are used often, because there are a lot of stairs to climb.
CONFIRMED: Holly 23 JUL 99
CONFIRMED: Mrs. Suzanne Witter 14 NOV 99
CONFIRMED: Duper00 17 FEB 01
Apartment: The area located just above Cinderella's Royal Table restaurant inside the castle was originally intended to serve as an apartment for Roy Disney Sr. and his family while staying at the WALT DISNEY WORLD® Resort. With the advent of Roy's death in 1971, the apartment was never built. Instead this area first served as the operations unit for Vista United Telecommunications (WALT DISNEY WORLD® switchboard operators). At the present time, it serves as the dressing rooms for the entertainers performing in the shows at the Castle Forecourt Stage.
http://www.talkdisney.com/forums/showthread/t-11219.html