Where was Capricorn One filmed?
1977 film by Peter Hyams
Capricorn One (1977) was filmed in Studio City and Red Rock Canyon State Park, 2 places named in its Wikipedia article's Shooting 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 Shooting section
Wikipedia’s Shooting section names 2 places. Each links to the sentence that says so.
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Landscapes & nature
Red Rock Canyon State Park
United States
California state park in Kern County featuring scenic desert cliffs, buttes, and spectacular rock formations
“Shooting locations included Cinema Center Films in Studio City, and Red Rock Canyon State Park.” Wikipedia
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Towns & cities
Studio City
United States
Neighborhood of Los Angeles, California, United States