10Buckingham Palace – London, UK
- Value: Estimated at $4.9 billion
As the official residence of the British monarch, Buckingham Palace is not only a symbol of the British royal family but also the most expensive house in the world. Built in 1703, the palace has 775 rooms, including 52 royal and guest bedrooms, 19 state rooms, 92 offices, and 78 bathrooms.
