Knollwood Estate
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For other uses of "Knollwood", see Knollwood (disambiguation).
40.82576°N 73.53633°W / 40.82576; -73.53633
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The Knollwood estate was a Gold Coast era castle-esque house and estate. Located in Muttontown, New York, U.S., its ruins are now part of the Muttontown Preserve.