The Man In The Iron Mask filmed at Château de Pierrefonds, Pierrefonds. Northeast of Paris lies this fortified castle, which serves as the exterior of the prison and the priest's home. On screen it's Bastille prison.
Probable Named in published production coverage; the coordinate is the place itself, checked against a gazetteer. This is a street or a long feature — the coordinate is a representative point on it, not a single spot.
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Venture keeps every scene location on one map, sorted by how far you'd have to walk. Open it in Pierrefonds and it tells you what was shot around you, how to get there, and whether you can actually go in.
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