Castles & palaces
Trematon Castle
A shell keep built on a motte and bailey castle
Wikipedia names Trematon 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 Trematon Castle. Each title’s page links to the sentence that says so.
The Secret GardenFantasy film2020
Filming locations nearby
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Towns & cities
Saltash
England · 2 km north-east
Town and civil parish in Cornwall, United Kingdom
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Castles & palaces
Antony House
England · 3 km south
Grade I listed historic house museum in Cornwall, England, UK
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Towns & cities
Torpoint
England · 4 km south-east
Town on the Rame Peninsula in southeast Cornwall, United Kingdom
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Landscapes & nature
HMNB Devonport
England · 4 km south-east
Operating base in the United Kingdom for the Royal Navy
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Towns & cities
Devonport
England · 6 km south-east
District of Plymouth in the English county of Devon
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Towns & cities
Millbrook
England · 6 km south
Civil parish and village in Cornwall, England