"Lynnewood Hall is a 110-room Neoclassical Revival mansion in Elkins Park, Montgomery County designed by architect Horace Trumbauer for industrialist Peter A. B. Widener between 1897 and 1900. Considered the largest surviving Gilded Age mansion in the Philadelphia, Pennsylvania area, it housed one of the most important Gilded Age private art collections of European masterpieces and decorative arts assembled by Widener and his younger son Joseph...
...Built from Indiana limestone, the "T"-shaped Lynnewood Hall (dubbed "The last of the American Versailles" by Widener's grandson) measures 325 feet (99 m) long by 215 feet (66 m) deep. In addition to the large art gallery, the 110-room estate also included a ballroom, swimming pool, wine cellars, a farm and an electrical power plant."