The postcard shows an aerial view of the Buckingham Palace and palace grounds. I had the chance to visit the palace during my UK visit in 2004, and both the facade and the interiors are really, really grand and magnificent. Really fit for a king/queen.
Buckingham Palace, located in the City of Westminster, is the official London residence and the administrative headquarters of the British Monarch. Buckingham Palace became the official royal palace of the British monarch on the accession of Queen Victoria in 1837.
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 metres long across the front, 120 metres deep (including the central quadrangle) and 24 metres high.
Buckingham Palace Wikipedia Entry
The Royal Residences: Buckingham Palace