Dangerous Liaisons filmed at Château de Lésigny, Lésigny. Château de Lésigny, roughly fifteen miles southeast of Paris, is where more of the film's interiors were shot.
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 Lésigny and it tells you what was shot around you, how to get there, and whether you can actually go in.
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