Doric pilasters, containing houses, the western one for the Director of the museum. The major surviving interiors are the entrance hall with the Great Stair – in the form of an Imperial staircase– rising to the west, and the "King's Library". This, built to house 65,000 books, is 300 feet long, 41 feet wide and 31 feet high, the centre section being slightly wider, with four great granite Corinthian columns. The only major interior to survive in the north wing is the "Arched Room" at the west end. The "Egyptian Gallery" matches the "King's Library" but is much plainer in decoration.