Chateau-sur-Mer is a historic mansion located in Newport, Rhode Island. Built in the mid-19th century, it showcases the Richardsonian Romanesque architectural style. The mansion was designed by architect George Champlin Mason and features intricate woodwork, beautiful gardens, and stunning views of the surrounding area. The estate was originally constructed for Charles Stewart Maurice, a wealthy businessman. Today, Chateau-sur-Mer is part of the Newport Mansions collection and is open to the public for tours. Visitors can explore its lavish interiors and learn about the history of the Gilded Age in Newport.