A visit to London isn't complete without seeing Buckingham Palace, the official residence of the British monarch. It's such an iconic building and im sure i dont need to explain why! It's where the royal family greets crowds from the famous balcony and hosts state events.
Its quite popular to watch the changing of the gaurd here, which takes place on certain days and times, so this is an activity to do if that interests you. Otherwise, you can take photos of the intricate building and iconic gaurds!