E. W. Marland Mansion

The E.W. Marland Mansion is a 43,561 square feet (4,046.9 m) Mediterranean Revival-style mansion located in Ponca City, Oklahoma, United States. Built by oil baron and philanthropist Ernest Whitworth (E.W.) Marland, as a display of wealth at the peak of the 1920s oil boom, the house is one of the largest residences in the southwestern United States, and is known as the "Palace on the Prairie."

• http://en.wikipedia.org/wiki/E. W. Marland Mansion