Though only a fraction of its Gilded Age mansions remain, Long Island still offers a glimpse of the opulence that F. Scott Fitzgerald found 100 years ago.

Old Westbury Gardens, a 200-acre estate with a 23-room, Charles II-style Restoration-style mansion, exudes the opulence that inspired “The Great Gatsby.”Credit...Tony Cenicola/The New York Times

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By Stefano Montali

In the fall of 1922, a 26-year-old F. Scott Fitzgerald and his wife, Zelda, moved into a Mediterranean-style house on Long Island, N.Y.