Castles & palaces
Bryn Bras Castle
Grade II* listed country house in Gwynedd, Wales
Wikipedia names Bryn Bras 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 Bryn Bras Castle. Each title’s page links to the sentence that says so.
Filming locations nearby
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Towns & cities
Llanberis
Wales · 4 km south-east
Village in Gwynedd, Wales
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Castles & palaces
Dolbadarn Castle
Wales · 5 km south-east
Castle in Gwynedd, Wales, built by the princes of Wales
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Landscapes & nature
Dinorwic Quarry
Wales · 6 km east
Large former slate quarry near Llanberis, Gwynedd, Wales and World Heritage Site.
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Towns & cities
Caernarfon
Wales · 6 km west
Town in Gwynedd, Wales
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Castles & palaces
Caernarfon Castle
Wales · 7 km west
Castle in Caernarfon, North Wales
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Streets & squares
Menai Suspension Bridge
Wales · 9 km north
Bridge between Anglesey and mainland Wales