Where was Blood of Dracula's Castle filmed?
1969 film by Al Adamson and Jean Hewitt
Blood of Dracula's Castle (1969) was filmed in Coachella Valley and Shea's Castle, 2 places named in its Wikipedia article's Production section, in the United States. 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.
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Landscapes & nature
Coachella Valley
United States
Valley in southern California, United States
“Other portions of the film were shot in the Coachella Valley, California.” Wikipedia
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Landmarks & buildings
Shea's Castle
United States
Private residence in Los Angeles County, California