Where was The Bishop's Bedroom filmed?

1977 film by Dino Risi

The Bishop's Bedroom (1977) was filmed in Verbania, Lake Maggiore, Stresa, Leggiuno, Baveno and Cannobio, 6 places named in its Wikipedia article, in Switzerland, 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

Places per Wikipedia's article

The Wikipedia article names 6 places. Each links to the sentence that says so.