United Kingdom - London - Buckingham Palace

Buckingham Palace has served as the official London residence of Britain's sovereigns since 1837 and today is the administrative headquarters of the Monarch.
Buckingham Palace has 775 rooms. These include 19 State rooms, 52 Royal and guest bedrooms, 188 staff bedrooms, 92 offices and 78 bathrooms. In measurements, the building is 108 meters long across the front, 120 meters deep (including the central quadrangle) and 24 meters high.

The Changing the Guard ceremony takes place in the forecourt of Buckingham Palace at 11.30 every day in summer, every other day in winter.
The New Guard marches to the Palace from Wellington Barracks with a Guards band, the Old Guard hands over in a ceremony during which the sentries are changed and then returns to barracks.