Where was Hercules, Samson and Ulysses filmed?
1963 film by Pietro Francisci
Hercules, Samson and Ulysses (1963) was filmed in Palazzo della Civiltà Italiana, 1 place named in its Spanish Wikipedia’s Locaciones section, 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.
Places per Spanish Wikipedia's Locaciones section
Spanish Wikipedia’s Locaciones section names 1 place. Each links to the sentence that says so.