As the home of the Queen, the palace is usually closed to visitors, but you may view the interior for a brief period each summer while the Windsors are away on their holidays. You'll be able to see the State Rooms, still used to entertain dignitaries and guests of state, and part of the gardens. There is also a café.
At any time of year, you can visit The Queen's Gallery to see her personal collection of treasures, including paintings by Rubens and Rembrandt.
See our guide to Buckingham Palace