Where was Ilsa, the Wicked Warden filmed?

1976 film by Jesús Franco

Ilsa, the Wicked Warden (1977) was filmed in Sintra and Rümlang, 2 places named in its Wikipedia article's Development section, in Portugal, Switzerland. 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.

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