Buckingham Palace

Buckingham Palace is the official London residence of the British monarch since 1837. Although in use for the many official events and receptions held by The Queen, the State Rooms at Buckingham Palace are open to visitors every year.
Buckingham Palace has 775 rooms. These include 19 State rooms, 52 Royal and guest bedrooms, 188 staff bedrooms, 92 offices and 78 bathrooms. The Palace is also the venue for great Royal ceremonies, State Visits and Investitures, all of which are organised by the Royal Household. Although Buckingham Palace is decorated with works of art that form part of the Royal Collection, one of the major art collections in the world today. It is not an art gallery and it is not a museum.
For those who do receive an invitation to Buckingham Palace, the first step across the threshold is into the Grand Hall and up the curving marble stairs of the Grand Staircase. Portraits are still set in the walls, as they were by Queen Victoria.
In the Throne Room The Queen, on very special occasions like Jubilees, receives loyal addresses. Another use of the Throne Room has been for formal wedding photographs. George IV's original palace lacked a large room in which to entertain. Queen Victoria rectified that shortcoming by adding in 1853-5 what was, at the time of its construction, the largest room in London. The Ballroom is the largest multi-purpose room in Buckingham Palace. Four Royal babies - The Prince of Wales, The Princess Royal, The Duke of York and Prince William - were all christened by the Archbishop of Canterbury in the Music Room.



http://www.royal.gov.uk/TheRoyalResidences/BuckinghamPalace/BuckinghamPalace.aspx