Where was The Giant of Marathon filmed?

1959 film by Mario Bava, Jacques Tourneur

The Giant of Marathon (1959) was filmed in Rome and Riserva naturale regionale Tor Caldara, 2 places named in its Wikipedia article, in Italy. 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.

See them on the map → Wikipedia Source data