Downton Abbey filmed at Wentworth Woodhouse, Wentworth. The Marble Saloon of this vast mansion serves as the ballroom where the royal party dances at the final ball. On screen it's Ballroom.
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 Wentworth and it tells you what was shot around you, how to get there, and whether you can actually go in.
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