Arthur filmed at Caumsett State Historic Park, Lloyd Harbor. The engagement party takes place at this former Marshall Field III estate on the Long Island coast. On screen it's Arthur's father's estate.
Probable Named in published production coverage; the coordinate is the place itself, checked against a gazetteer.
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Venture keeps every scene location on one map, sorted by how far you'd have to walk. Open it in Lloyd Harbor and it tells you what was shot around you, how to get there, and whether you can actually go in.
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