Built by Richard Morris Hunt for millionaire William K. Vanderbilt, Marble House evokes both the Petit Trianon of Versailles and the Parthenon of Athens. Behind the heavy doorway lies a grandiose interior with Gobelins tapestries in the entrance hall, a richly decorated ballroom, a Gothic room with stained-glass windows, and a sumptuous dining room adorned with pink marble from Algeria. Don't miss the Chinese Teahouse at the rear of the property, which is open to the public.