largest mansion in usa
According to the National Park Service, all but three are protected as National Historic Landmarks. Here are the ten biggest mansions in America: 1  Kykuit (Sleepy Hollow, New York) John D. Rockefeller built one of Americanâs grandest mansions in 1913, with Standard Oil money. 2  The hilltop manor overlooks the Hudson River Valley. 3  It features a neo-classical facade faÃ§ade and romantic interior.  details