Where was the Fårö trilogy filmed?

The Fårö trilogy has 3 titles (1968 to 1969). Wikidata records no filming place for them; Wikipedia names Stockholm, Visby, Solna Municipality, Fårö, Filmstaden and 1 more place. Every place links to its source.

The productions, in order

Named in Wikipedia's own articles

Places named only in the titles’ Wikipedia articles.