Where was The Keep filmed?
1983 film by Michael Mann
The Keep (1983) was filmed in Blaenau Ffestiniog, Llanberis, Shepperton Studios and Llechwedd Slate Caverns, 4 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 4 places. Each links to the sentence that says so.
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Studios & sets
Shepperton Studios
United Kingdom
Film studio, special effects studios and pre- and post-production centre
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Towns & cities
Blaenau Ffestiniog
Wales
Historic mining town in Gwynedd, Wales
“Some interiors of the keep utilised the stonework within the Llechwedd Slate Caverns, near Blaenau Ffestiniog.” Wikipedia
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Towns & cities
Llanberis
Wales
Village in Gwynedd, Wales
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Landmarks & buildings
Llechwedd Slate Caverns
Wales
Tourist attraction in Gwynedd, Wales
Also shot in these places
World War ZHorror film2013