Castles & palaces
Dolbadarn Castle
Castle in Gwynedd, Wales, built by the princes of Wales
Wikipedia names Dolbadarn 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 Dolbadarn Castle. Each title’s page links to the sentence that says so.
Filming locations nearby
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Towns & cities
Llanberis
Wales · 1 km north-west
Village in Gwynedd, Wales
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Landscapes & nature
Dinorwic Quarry
Wales · 1 km north-east
Large former slate quarry near Llanberis, Gwynedd, Wales and World Heritage Site.
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Castles & palaces
Bryn Bras Castle
Wales · 5 km north-west
Grade II* listed country house in Gwynedd, Wales
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Landscapes & nature
Snowdon
Wales · 6 km south-east
Highest mountain in Wales
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Landscapes & nature
Tryfan
Wales · 8 km east
Mountain (917.5m) in Conwy County Borough
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Landmarks & buildings Cwm Dyli
Wales · 9 km south-east
Hydroelectric power station in Gwynedd, Wales, UK