Landscapes & nature
Clearwell Caves
Cave system in Clearwell, England
Wikipedia names Clearwell Caves as where 2 films and series were filmed; each title’s page links to the sentence that says so. Wikidata records no shoot here yet.

Filmed here, per Wikipedia
Wikipedia says these were filmed in Clearwell Caves. Each title’s page links to the sentence that says so.
Filming locations nearby
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Landscapes & nature
Puzzlewood
England · under 1 km
Ancient woodland site, near Coleford in the Forest of Dean, Gloucestershire, England
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Towns & cities
Redbrook
England · 5 km north-west
Village in Gloucestershire, United Kingdom
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Landscapes & nature Forest of Dean
United Kingdom · 6 km east
Geographical, historical and cultural region in Gloucestershire, England
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Towns & cities
Llandogo
Wales · 7 km south-west
Village in Monmouthshire, United Kingdom
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Towns & cities
Lydney
England · 8 km south-east
Town in Gloucestershire, UK
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Landmarks & buildings
Otis' house
United Kingdom · 8 km north
Building in Symonds Yat, United Kingdom