Enrico Caruso sang in its grand ballroom, and Arturo Toscanini lifted his baton to its soaring ceiling. Constructed in 1919, OHEKA Castle, Long Island's largest Gold Coast mansion, was once described by the New York Times as the "finest country house in America." Appearing as the mysterious mountaintop castle in the opening scenes of the film classic Citizen Kane, its majestic edifice and meticulous grounds continue to dazzle the screens of major Hollywood movies and television shows. It was a playground for the rich and famous of the Gilded Era, when heads of state, royalty, stage and screen...