Where was Citadel: Diana filmed?

Italian television series

Citadel: Diana was filmed at one place in Switzerland: Lugano. The place comes from Wikidata.

See them on the map → Wikipedia Source data

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