Where was The Innocents filmed?
1961 film directed by Jack Clayton
The Innocents (1961) was filmed in Haywards Heath, Shepperton Studios and Sheffield Park Garden, 3 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 3 places. Each links to the sentence that says so.
Places whose own article says it was shot there
1 place says on its own Wikipedia page that this film was shot there. Not on the map: the quote is linked so you can check it.
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Landscapes & nature
Sheffield Park Garden
England
Park in East Sussex, England, UK
“The estate was used for exterior shooting in the 1961 film, The Innocents, where it served as the Gothic Bly Manor, the setting of the Henry James novella, The Turn of the Screw.” Wikipedia