See inside Eagle’s Nest, the 42-acre New York Vanderbilt estate where a Gilded Age heir built his sprawling mansion

Can you hear “The Last Great American Dynasty” playing in the distance?

There are many historical mansions on Long Island, but only one was once owned by the legendary Vanderbilt family. The 42-acre estate of William Kissam Vanderbilt II, which included his summer “cottage” of Eagle’s Nest, is now a museum that’s open to the public.

Eagle’s Nest was first built in 1910 as a small cottage, but as William II spent more time there, it expanded until 1936, when a full redesign was finished: It had become a 24-room Spanish Revival mansion.

William II spent time at Eagle’s Nest until his death in 1944. His will stipulated that upon his wife…

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