Where was The Monster of Piedras Blancas filmed?
1959 film
The Monster of Piedras Blancas (1959) was filmed in Lompoc, Cayucos and Point Conception Light, 3 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 3 places. Each links to the sentence that says so.
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Towns & cities
Lompoc
United States
City in Santa Barbara County, California, United States
“The lighthouse locations were shot at the Point Conception lighthouse near Lompoc, and the film's town was actually the seaside city of Cayucos, about 30 miles south of the real Piedras Blancas.” Wikipedia
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Landmarks & buildings
Point Conception Light
United States
Lighthouse in California, United States
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Towns & cities
Cayucos
United States
Census designated place in San Luis Obispo County, California, United States