Take a tour around this beaux-arts mansion, the home of Ogden Mills and his wife Ruth. The Mills family made its fortune by investing in banks, railroads and mines during the Gilded Age; the house boasts 79 luxurious rooms filled with brocaded Flemish tapestries, gilded plasterwork, period paintings and Oriental art. Find it 6 miles south of Rhinebeck, just off Rte 9.