The world of real estate is full of luxury homes, but some houses are simply out of this world. Here are 7 of the most expensive houses in the world:

1. Antilia
Antilia is a 27-story, 400,000-square-foot home in Mumbai, India. It is owned by Mukesh Ambani, the richest man in India. Antilia has 16 floors of parking, a 9-hole golf course, a spa, and a movie theater. It is estimated to be worth $1 billion.
2. The One
The One is a 100,000-square-foot home in Bel Air, California. It is owned by Nile Niami, a film producer. The One has 12 bedrooms, 23 bathrooms, and a rooftop helipad. It is estimated to be worth $500 million.
3. Villa Leopolda
Villa Leopolda is a 18-acre estate in Villefranche-sur-Mer, France. It was once owned by King Leopold II of Belgium. Villa Leopolda has 11 bedrooms, 14 bathrooms, and a tennis court. It is estimated to be worth $500 million.
4. Fairfield Pond
Fairfield Pond is a 63-acre estate in Greenwich, Connecticut. It is owned by hedge fund manager Ray Dalio. Fairfield Pond has 13 bedrooms, 27 bathrooms, and a bowling alley. It is estimated to be worth $400 million.
5. 10 Bel Air Road
10 Bel Air Road is a 90,000-square-foot home in Los Angeles, California. It is owned by media mogul David Geffen. 10 Bel Air Road has 12 bedrooms, 23 bathrooms, and a screening room. It is estimated to be worth $350 million.
6. Updown Court
Updown Court is a 160-acre estate in Surrey, England. It is owned by Lakshmi Mittal, the chairman of ArcelorMittal. Updown Court has 12 bedrooms, 23 bathrooms, and a golf course. It is estimated to be worth $300 million.
7. Wynn Estate
Wynn Estate is a 90,000-square-foot home in Los Angeles, California. It is owned by casino mogul Steve Wynn. Wynn Estate has 13 bedrooms, 27 bathrooms, and a nightclub. It is estimated to be worth $250 million.
These are just a few of the most expensive houses in the world. If you have the money, these houses offer the ultimate in luxury and opulence.