ft mansion of railroad magnate Edward Henry Harriman in Harriman, New York Boldt Castle: legendary island estate, one of America's largest private residences Boscobel: the Federal style estate of States Dyckman by the Hudson River in Garrison, New York Camp Pine Knot: the earliest of the Great Camps of the Adirondacks, a National Historic Landmark Charles W. Goodyear House; home of lawyer and businessman Charles W. Goodyear in Buffalo, New York Coindre Hall: the 30,000 square foot mansion of pharmaceutical magnate George McKesson Brown in Huntington, New York Coe Hall: the 67-room mansion of William R. Coe in Oyster Bay, New York Cornelius Vanderbilt II House: the largest private residence ever constructed in New York City was home to the eldest grandson of tycoon Cornelius Vanderbilt Dark Island: fantasy castle by Ernest Flagg "(Singer Castle") Eagle's Nest: the residence of William Kissam Vanderbilt II in Centerport, New York, now home to a museum and planetarium Edgewater: in Barrytown, New York, built about 1825. The Frick Collection: former residence of steel magnate Henry Clay Frick, adjacent Central Park in Manhattan, New York City Gracie Mansion: official residence of New York City's mayor Harriet Phillips Bungalow Harbor Hill: the Gold Coast, Long Island estate of Clarence Hungerford Mackay was one of the 10 largest residences in America Hempstead House: the massive Gould-Guggenheim estate, and now park, on Long Island's gold coast in Sands Point, New York Hyde Park: the Hudson Valley estate of Frederick W. Vanderbilt. Indian Neck Hall: a Georgian-style country residence of Frederick Gilbert Bourne located on the Great South Bay in Oakdale, New York Inisfada: the huge Tudor Revival mansion of Nicholas Frederic Brady on Long Island Kykuit: the residence of oil tycoon John D. Rockefeller in Tarrytown on the Hudson River Lower East Side Tenement Museum, a six-story brick tenement building that was home to an estimated 7,000 people, from over 20 nations, between 1863 and 1935, in New York City. Mills Mansion: the Beaux-Arts mansion of financier Ogden Mills on the Hudson River in Staatsburg, New York. Oheka Castle: also known as the Otto Kahn Estate, it is a large country estate located on the Gold Coast of Long Island's north shore, at Huntington, Suffolk County, New York, and was the residence of financier and philanthropist Otto Kahn Petit Chateau: a Châteauesque mansion for William Kissam Vanderbilt and Alva Vanderbilt at 660 Fifth Avenue, New York City