Le Belvedere Mansion in Bel Air, California

America's most expensive home sold in 2010 (more than $46,500,000). The owner put the home on the market in early 2009 at $85 million, but the price was quickly cut to $72 million. The buyer is unidentified and the exact selling price is not disclosed.

Designed and built in 2006 by developer Mohamed Hadid, former owner of Ritz Carlton Hotels, for his personal use. The 10-bedroom, 14-bathroom Le Belvedere sits on a 2.2-acre bluff and spans 48,000 square feet. Encircling the property is a 36-foot-high Jerusalem stone wall that stretches 1,000 feet and encloses lavish amenities like an infinity pool and 1.5 acres of gardens. Inside the home, no detail is spared. Its 19 fireplaces are made from imported Italian marble, all of the wood details are hand-carved and the floors are laid in Bavarian walnut. Public rooms include a reception hall, formal living and dining rooms, an informal dining room, a family room with a bar lounge, a music room, a library, 5,000 bottle wine cellar and tasting room, a ballroom, commercial kitchen and a game room. The main master bedroom suite including a sitting room, powder room, his and hers bathrooms and dressing rooms. There is a full gym, a swan pond and a 50-seat European-style theater. There are also some unique touches, including a Moroccan room with a Turkish bath. There is ample secure parking for 20 vehicles, and a motor court provides outdoor parking. Fountains and rose gardens grace the manicured grounds.