Most Expensive Houses in the world

1. Buckingham Palace -- $1.55 billion

1. Buckingham Palace -- $1.55 billion The official home of the British monarchy has 775 rooms and is dripping with priceless furniture a...

2. Antillia -- $1 billion Owned by Indian billionaire industrialist Mukesh Ambani, this 27-story, 400,000 square-foot south-Mumbai estat...

3. Villa Leopolda -- $750 million This palatial series of villas and gardens located in the town of Villefranche-sur-Mer on the French R...

4. Rutland Gate Mansion -- $436.5 million The mansion at 8a Rutland Gate in London's Hyde Park neighborhood has been empty for thre...

5. Four Fairfield Pond -- $248.5 million Located in Sagaponack, N.Y., two villages over from ultra-chic East Hampton, this 29-bedroom es...

6. 18-19 Kensington Palace Gardens -- $222 Million Owned by Lakshmi Mittal, head of the world's largest manufacturer of steel, this L...

7. Ellison Estate -- $200 million Oracle ( ORCL ) billionaire Larry Ellison owns this Woodside, Calif. home that sits on a 23-acre comp...