Where was Kamen Rider X filmed?
Japanese television series
Kamen Rider X (1974–) was filmed in Cape Tsurugi, 1 place named in its Japanese Wikipedia’s 神話怪人 section, in Japan. 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.
Part of the Kamen Rider Series
Places per Japanese Wikipedia's 神話怪人 section
Japanese Wikipedia’s 神話怪人 section names 1 place. Each links to the sentence that says so.
