Marble House is a Gilded Age mansion at 596 Bellevue Avenue in Newport, Rhode Island, now open to the public as a museum run by the Preservation Society of Newport County. It was designed by the society architect Richard Morris Hunt. For an American house, it was unparalleled in design and opulence when it was built. Its temple-front portico, which also serves as a porte-cochère, resembles that of the White House.