Built between 1858 and 1860, this Italianate mansion is widely regarded as the most sumptuously ornamented dwelling of its period remaining in the country. Architect Henry Austin designed the house for hotelier Ruggles Morse and his wife, Olive. The interior design—everything from the plasterwork to the furniture (much of it original)—is the only surviving commission of New York designer Gustave Herter. Behind the elegant brownstone exterior of this National Historic Landmark are colorful frescoed walls and ceilings, ornate marble mantelpieces, gilded gas chandeliers, a magnificent 6-foot-by-25-foot stained-glass ceiling window, and a freestanding mahogany staircase. Guided tours run about 45 minutes and cover all the architectural highlights. Victorian era–themed gifts and art are sold in the museum shop.