Vanderbilt Mansion National Historic Site, located in Hyde Park, New York, is one of America's premier examples of the country palaces built by wealthy industrialists during the Gilded Age.
The site includes 211 acres of the original larger property historically named Hyde Park. Situated on the east bank of the Hudson River, the property includes pleasure grounds with views of the river and the distant Catskill Mountains, formal gardens, natural woodlands, and numerous auxiliary structures. The grounds also include Italian Gardens. Frederick William Vanderbilt purchased the property in 1895 for use as a seasonal country residence.
Its main feature is a 54-room mansion. Designed and built between 1896–1899, the house is a good example of the Beaux-Arts architecture style. The interior of the mansion is an archetypes of the American Renaissance, incorporating a range of European antiques and finely crafted period reproductions.
The house has a classic Beaux-Arts plan with the major public rooms on its ground floor - the central Elliptical Hall, Dining Room, and Living Room arranged in an axial arrangement parallel to the Hudson River. North and South Foyers provide transitional space from the Hall to the Dining Room and Living Room. Five secondary spaces are located off the Elliptical Hall: the Lobby, Den, Gold Room, Grand Stair Hall, and Lavatory. The second floor rooms, comprising Mrs. Vanderbilt's suite of Bedroom, Boudoir and Bathroom (designed by Ogden Codman), Mr. Vanderbilt's Bedroom and Bathroom, Guest Bedrooms and Baths and the Linen Room, are disposed around the Second Floor Hall and the North and South Foyers. The third floor contains five additional guest bedrooms, and a Servants' Hall separated from the guests' rooms by a door at the main staircase. Supported by both concrete and steel, the Vanderbilt mansion was considered modern for its time.
The mansion also included plumbing and forced hot air central heating and electric lighting which was powered by a hydroelectric plant built on the estate on the Crumb Elbow stream—the Vanderbilt estate had electric lighting before the surrounding area.