Clockwise from left: Oheka Castle in Huntington; Eagle’s Nest mansion in Centerport, known today as the Vanderbilt Museum; and Hempstead House. (Photo credit: Oheka Castle, Vanderbilt Museum and Sands Point Preserve)

Credit: Oheka Castle

Oheka Castle in Huntington, built by financier and philanthropist Otto Hermann (cq) Kahn, was 'Xanadu' in the opening of the 1941 movie classic, 'Citizen Cane,' and the mansion is where singer Taylor Swift filmed her music video, 'Blank Space'....Credit: Oheka Castle....XLHOMES200316

Credit: Vanderbilt Museum

Inside Eagle's Nest mansion in Centerport, known today as the Vanderbilt Museum, are wildlife and marine-life dioramas by the same artisans who created those found in the American Museum of Natural History in Manhattan..Credit: Vanderbilt Museum.

Credit: Sands Point Preserve

Hempstead House, this massive 50,000 square foot Tudor style mansion was the former summer residence of Howard Gould (1912-1917) and later Daniel and Florence Guggenheim (1917-1930)...XLHOMES200316

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