Valmont filmed at Château de la Motte-Tilly, Nogent-sur-Seine. Madame de Rosemonde's estate is this 18th-century château, about fifty miles east of Paris. On screen it's Estate of Mme de Rosemonde.
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 Nogent-sur-Seine and it tells you what was shot around you, how to get there, and whether you can actually go in.
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