3. Biltmore Estate – Asheville, North Carolina – 178,926 square feet
Based in Asheville, North Carolina, the Biltmore Estate is considered as the largest private residence in the United States. It has been realized between 1889 e il 1895 at the behest of George Washington Vanderbilt II and it is still owned by the family. The main building of the estate is made in the French Renaissance style and boasts 250 rooms. Moreover, there are a bowling alley, a book library and a huge indoor swimming pool. So, a big house that could represent the one of your dreams.