Towns & cities
Bangor
City in Gwynedd, Wales
Wikipedia names Bangor 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 Bangor. Each title’s page links to the sentence that says so.
Filming locations nearby
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Castles & palaces
Penrhyn Castle
Wales · 2 km east
Country house in Llandygái, Gwynedd, Wales
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Streets & squares
Menai Suspension Bridge
Wales · 2 km west
Bridge between Anglesey and mainland Wales
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Towns & cities
Penmon
Wales · 10 km north-east
Village in Wales
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Castles & palaces
Bryn Bras Castle
Wales · 10 km south
Grade II* listed country house in Gwynedd, Wales
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Landscapes & nature
Dinorwic Quarry
Wales · 12 km south
Large former slate quarry near Llanberis, Gwynedd, Wales and World Heritage Site.
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Towns & cities
Llanberis
Wales · 12 km south
Village in Gwynedd, Wales