Royal Stairway
This inside the Caserta Palace, this staircase was used as the Vatican staircase in the movie Angels and Demons. At the top of this staircase, are rooms used in a few films:
"The Caserta Palace has been used as a filming location in a number of movie productions. In 1999 it served as a filming location for Star Wars when it was used as the setting for Queen Amidala's Royal Palace on Naboo in the 1999 film Star Wars Episode I: The Phantom Menace. It featured again in the 2002 film Star Wars Episode II: Attack of the Clones as Queen Jamilla's palace.
The same room was also used in Mission: Impossible III as Vatican City. In fact, the square where the Lamborghini is blown up is actually the square inside the Palace.
The main staircase is also used in Angels & Demons as the Vatican's staircase. The mezzo soprano Cecilia Bartoli used the palace as primary location for the film "L'art des castrats" that accompanies her album "Sacrificium", dedicated to the music written for the castrato singers of the baroque period."
Source: http://en.wikipedia.org/wiki/Palace_of_Caserta