Where was Quatermass and the Pit filmed?
1967 film by Roy Ward Baker
Quatermass and the Pit (1967) was filmed in Borehamwood, 1 place named in its Wikipedia article's Filming 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 Filming section
Wikipedia’s Filming section names 1 place. Each links to the sentence that says so.
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Towns & cities
Borehamwood
England
Town in Hertfordshire, England, UK
“At this time, Hammer was operating out of the Associated British Studios in Elstree, Borehamwood.” Wikipedia
Also shot in these places
A Clockwork OrangeScience fiction film1971