Biltmore Estate, Asheville, North Carolina: The largest privately-owned home in the U.S., the Biltmore Estate spans 175,000 square feet with 250 rooms.
Oheka Castle, Huntington, New York: This French-style chateau on Long Island covers 115,000 square feet.
Whitemarsh Hall, Wyndmoor, Pennsylvania: Although demolished in 1980, Whitemarsh Hall once spanned 100,000 square feet.
Biltmore Hotel, Coral Gables, Florida: Originally a private residence, this 96,000-square-foot mansion became a luxury hotel.
Versailles, Windermere, Florida: A private residence still under construction, Versailles is planned to be 90,000 square feet.
The One, Bel Air, California: Known as the most expensive home in America, this 74,000-square-foot mansion includes 21 bedrooms, 42 bathrooms, a 30-car garage, a nightclub, and a four-lane bowling alley.
Fairfield Pond, Sagaponack, New York: Owned by billionaire Ira Rennert, this 63-acre estate includes a 62,000-square-foot main house.