Landmarks & buildings
Llechwedd Slate Caverns
Tourist attraction in Gwynedd, Wales
Wikipedia names Llechwedd Slate Caverns 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 Llechwedd Slate Caverns. Each title’s page links to the sentence that says so.
The KeepHorror film1983
Filming locations nearby
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Towns & cities
Blaenau Ffestiniog
Wales · 1 km south
Historic mining town in Gwynedd, Wales
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Landscapes & nature
Graig Ddu Quarry
Wales · 2 km south-east
Disused slate quarry near Blaenau Festiniog in North Wales, UK
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Castles & palaces
Dolwyddelan Castle
Wales · 6 km north
Castle in Conwy County Borough, Wales
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Landscapes & nature
Llyn Gwynant
Wales · 7 km north-west
Lake in Gwynedd, Wales
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Landscapes & nature
Eryri National Park
Wales · 8 km south
National park in Wales
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Towns & cities Nant Gwynant
Wales · 8 km north-west
Valley in Beddgelert, Gwynedd, Wales, UK