Castles & palaces
Cardiff Castle
Castle in Cardiff, Wales
Wikipedia names Cardiff Castle as where 3 films and series were filmed; each title’s page links to the sentence that says so. Wikidata records no shoot here yet.

Filmed here, per Wikipedia
Wikipedia says these were filmed in Cardiff Castle. Each title’s page links to the sentence that says so.
Filming locations nearby
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Towns & cities
Cardiff
Wales · under 1 km
Capital city of Wales, United Kingdom
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Streets & squares
Working Street
Wales · under 1 km
Historic street in Cardiff
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Landmarks & buildings
Cardiff Central police station
United Kingdom · under 1 km
Police station in Cardiff, Wales
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Landmarks & buildings
City Hall of Cardiff
Wales · under 1 km
Grade I listed building in Cardiff. Civic building in Cardiff, Wales
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Landmarks & buildings
New Theatre
Wales · under 1 km
Theatre in Cardiff, Wales
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Landmarks & buildings National Museum Cardiff
Wales · under 1 km
Main site of the national museum of Wales, United Kingdom