Whitehall is a 75-room, 100,000 square foot Gilded Age mansion open to the public in Palm Beach, Florida in the United States. Completed in 1902, it is a major example of neoclassical Beaux Arts architecture designed by Carrère and Hastings for Henry Flagler, a leading captain of industry in the late 19th century, and a leading developer of Florida as a tourist destination. The building is listed a National Historic Landmark. It now houses the Henry Morrison Flagler Museum, named after its builder. History Henry Flagler, one of the founders of Standard Oil, built Whitehall for his third wife, Mary Lily Kenan. The site of the home was purchased for $50,000 in 1893 (as of 2010 that would be $1,197,562.39) by Flagler. The site was later surveyed for construction in July 1900 and the home was completed in time for Flagler and his wife to move in on February 6, 1902. The architects were John Carrère and Thomas Hastings, who had earlier designed the Ponce de Leon Hotel and several other buildings in St. Augustine for Flagler. Whitehall was to be a winter residence, and Henry gave it to Mary Lily as a wedding present. They would travel to Palm Beach each year in one of their own private railcars, one of which was No. 91. Flagler died of injuries sustained in falling down a flight of marble stairs at Whitehall in 1913, at the age of 83. Mary Lily died four years later, and the home was devised to her niece Louise Clisby Wise Lewis, who sold the property to investors. They constructed a 300-room, ten-story addition to the west side of the building, obliterating Mr. Flagler's offices and the housekeeper's apartment, and altering the original kitchen and pantry area. Carrere and Hastings were the architects of the 1925 reconstruction. In 1939 it was described as a $4,000,000 building and Palm Beach's second-largest hotel. Museum In 1959, the site was saved from demolition by one of Henry Flagler's granddaughters Jean Flagler Matthews. She established the Henry Morrison Flagler Museum non-profit corporation, which purchased the building in 1959, opening it as a museum in 1960. The upper ten stories of the hotel addition were demolished in 1963 in preparing the museum for the public. Today, Whitehall is a National Historic Landmark and is open to the public as the Henry Morrison Flagler Museum, featuring guided tours, exhibits, and special programs.