Where was Citadel: Diana filmed?
Italian television series
Citadel: Diana was filmed at one place in Switzerland: Lugano. The place comes from Wikidata.
Filming locations
Also per Wikipedia's article
The Wikipedia article names 4 more places. Each links to the sentence that says so.
Recorded only at country level
Also filmed in Canton of Ticino, but the exact places are not known, so they are not on the map.
Also shot in these places
More filmed in Switzerland
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On Her Majesty's Secret ServiceSpy film1969
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