Where was Kamen Rider (1971–) filmed?
1971 Japanese tokusatsu TV series
Kamen Rider (1971–) was filmed in Kawasaki, Sakurajima and Asao-ku, 3 places named in its Wikipedia article, 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 Wikipedia's article
The Wikipedia article names 3 places. Each links to the sentence that says so.

