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Built for fourth-generation winemaker Dario Sattui as the only authentically styled 13th-century Tuscan castle winery in America; now, the medieval-style castle is one of the most popular wineries in Napa Valley.

Designed by painter Frederic Church, the ornate villa in Hudson, N.Y. is known as the artist's living masterpiece; now, Olana is a National Historic Landmark with a surrounding 250-acre landscape that visitors can enjoy daily.

Located on the campus of Manhattanville College in Purchase, N.Y., the renaissance revival structure was completed in 1892 as a private home for diplomat and owner of the New York Herald Tribune, Whitelaw Reid.

Built by industrialist John Pitcairn in 1895, the architecture of the gilded age structure blends inspiration from the French Renaissance with classical Greek and Roman influences.