Downton Abbey filmed at Inveraray Castle, Inveraray. Scenes for the fictional Duneagle Castle, where the family stays on a Highlands trip, were shot at this Scottish castle. On screen it's Duneagle Castle.
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 Inveraray and it tells you what was shot around you, how to get there, and whether you can actually go in.
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