Castles & palaces
Dolwyddelan Castle
Castle in Conwy County Borough, Wales
Wikipedia names Dolwyddelan 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 Dolwyddelan Castle. Each title’s page links to the sentence that says so.
DragonslayerFantasy film1981
Filming locations nearby
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Towns & cities Capel Curig
Wales · 6 km north
Village and community in Conwy County Borough, Wales, UK
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Landmarks & buildings
Llechwedd Slate Caverns
Wales · 6 km south
Tourist attraction in Gwynedd, Wales
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Towns & cities
Blaenau Ffestiniog
Wales · 7 km south
Historic mining town in Gwynedd, Wales
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Landscapes & nature
Graig Ddu Quarry
Wales · 7 km south
Disused slate quarry near Blaenau Festiniog in North Wales, UK
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Landmarks & buildings Cwm Dyli
Wales · 7 km west
Hydroelectric power station in Gwynedd, Wales, UK
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Landscapes & nature
Llyn Gwynant
Wales · 8 km west
Lake in Gwynedd, Wales