Long Island's great estates are the topic of a full-day symposium Oct. 3 at The Long Island Museum in Stony Brook, which has a current exhibit on the topic. The event will run from 9:45 a.m. to 3:30 p.m. and include a keynote address by architectural historian Richard Guy Wilson, who has written about Louis Comfort Tiffany's Laurelton Hall in Laurel Hollow, one of the estates explored in the museum's exhibit.

Other speakers at the symposium will look at the rise and fall of Long Island's great estates and discuss the importance of preservation. The event will also include a screening of the 1921 silent film "The Beggar's Maid," which was filmed at Laurelton Hall.

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Along with Laurelton Hall, "Gilding the Coasts: Art & Design of Long Island's Great Estates" also features Stanford White's Box Hill in St. James, which still stands, and muralist and canvas painter William de Leftwich Dodge's Villa Francesca in Setauket, which was destroyed by a fire.

The exhibit, which runs through Oct. 25, includes than 150 artifacts, including furniture, sculpture and paintings.

Admission to the symposium is $12 per person and $10 for students, seniors and museum members, paid in advance. There is also an optional $10 lunch. Call the museum's education director, Lisa Unander, at 631-751-0066, ext. 212, to request a registration form.

The museum is at 1200 Rte. 25A, Stony Brook.