Where was 21 Days filmed?
1940 British drama film directed by Basil Dean
21 Days (1940) was filmed in Denham Film Studios, 1 place named in its Wikipedia article's Production section, 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 Production section
Wikipedia’s Production section names 1 place. Each links to the sentence that says so.
