Where was Inside No. 9 filmed?
British dark comedy anthology television program
Inside No. 9 (2014–) was filmed in Twickenham Film Studios and Chiltern Open Air Museum, 2 places named in its Wikipedia article, in the United Kingdom. Wikidata records no filming location for it at all, so the article is the only recorded source. Each place says where its claim comes from.
Places per Wikipedia's article
The Wikipedia article names 2 places. Each links to the sentence that says so.
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Landmarks & buildings
Chiltern Open Air Museum
England
Museum in the Chiltern Hills, United Kingdom
“The other episodes were filmed on location; for example, "The Trial of Elizabeth Gadge" was filmed in a barn at the Chiltern Open Air Museum.” Wikipedia
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Studios & sets
Twickenham Film Studios
England
British film studio
Also shot in these places
Mary, Queen of ScotsHistorical film1971