When she is inside you can see her flag, the Royal Standard, flying from the flag pole on the roof.
There are over 600 rooms in Buckingham palace, including: 78 bathrooms, 92 offices, a cinema and a swimming pool. Lots of important state banquets and Royal Garden Parties are held there each year.
The Household Troops guard Buckingham Palace. A Changing of the Guard ceremony takes place outside each morning.