Where was Dracula and Son filmed?
1976 film by Édouard Molinaro
Dracula and Son (1976) was filmed in Lassay-les-Châteaux and Castle of Lassay, 2 places named in its Wikipedia article's Production section, in France. 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 2 places. Each links to the sentence that says so.