Castles & palaces
Pencoed Castle
Historic site in Newport, Wales
Wikipedia names Pencoed Castle as where 1 film or series was filmed; its page links to the sentence that says so. Wikidata records no shoot here yet.

Filmed here, per Wikipedia
Wikipedia says these were filmed in Pencoed Castle. Each title’s page links to the sentence that says so.
Filming locations nearby
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Towns & cities
Venta Silurum
Wales · 6 km east
Town in the Roman province of Britannia or Britain
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Towns & cities
Caerwent
Wales · 6 km east
Village and community in Monmouthshire, Wales
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Landmarks & buildings
Royal Navy Propellant Factory, Caerwent
Wales · 7 km east
Military site
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Towns & cities
Caerleon
Wales · 7 km west
Village and community in Newport, Wales, UK
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Landmarks & buildings
Caerleon campus
Wales · 7 km west
Former university campus in Caerleon, Wales
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Landmarks & buildings
Newport International Sports Village
Wales · 8 km south-west
Sport complex in Newport, Wales