The world's largest palace by both floor space and volume is the Palace of the Parliament in Bucharest, Romania, which was built by communist dictator Nicolae Ceaușescu in 1986. It has a floor space of 330,000 m 2 and a volume of 2,550,000 m 3. It is also the most expensive administrative building and heaviest building.
The throne room is usually not used for ambassadors arrival which is usually in the ambassadors room of Buckingham Palace. Apart from the Thrones in the room actually named Throne Room, there is also a pair of Thrones in the Buckingham Palace Ballroom, that is a larger multi-purpose hall within the Palace.