WORLD’S MOST EXPENSIVE HOUSE
Value: $1.55 billion
Details: Technically still a house, but certainly not for sale, the Queen’s residence was valued at roughly $1.5 billion by the Nationwide Building Society in 2012. The property holds 775 rooms, including 19 staterooms, 52 bedrooms, 188 staff rooms, 92 offices, and 78 bathrooms. Owner: The British Sovereign—Currently Queen Elizabeth II, who has ruled since February 6, 1952.