Where was Acier filmed?
1933 Italian film directed by Walter Ruttmann
Acier (1933) was filmed in Terni, 1 place named in its Wikipedia article, in Italy. 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 1 place. Each links to the sentence that says so.
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Towns & cities
Terni
Italy
Italian comune
“The film was shot on location at the steel mills in Terni in Umbria.” Wikipedia