10 of the World's Most Insanely Luxurious Houses- 2. Updown Court, England - The most important private residence to be built in England since the 19th century. Updown Court is situated only 25 miles from London. The property is best known for its price tag: more than (150 million US$, 103 rooms, 5 swimming pools, 24-carat-gold leafing on the study's mosaic floor. The property has a squash court, bowling alley, tennis court, 50-seat screening room, heated marble driveway and helipad.