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1) Buckingham Palace, London

Estimated value: $2.9 billion

With 775 rooms, including 52 royal and guest bedrooms, 78 bathrooms, and 92 offices, the Queen's London home still holds the top ranking for the most expensive house in the world. Although the British royal family owns many castles and estates throughout the United Kingdom, Buckingham Palace has been the monarchy's official residence since 1837. Queen Elizabeth II spends her annual summer holiday at Balmoral Castle in Scotland's Highlands.

The Most Expensive House in the World Belongs to a Woman

Check out her palatial digs plus 15 more mega-mansions for a fantasy-filled look at the lavish life.

From Veranda