Where was Porno Holocaust filmed?
1981 film by Joe D'Amato, Bruno Mattei
Porno Holocaust (1981) was filmed in Santo Domingo and Hispaniola, 2 places named in its Wikipedia article, in the Dominican Republic. 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 article
The Wikipedia article names 2 places. Each links to the sentence that says so.
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Towns & cities
Santo Domingo
Dominican Republic
Capital of the Dominican Republic
“Shot in and around Santo Domingo, it was one of the first cinematically released Italian films containing hardcore pornography.” Wikipedia
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Landscapes & nature
Hispaniola
Dominican Republic
Island in the Caribbean