Castles & palaces
Fort Mahon
Fort located on the coast of the Strait of Dover, northern France
Wikipedia names Fort Mahon 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 Fort Mahon. Each title’s page links to the sentence that says so.
Filming locations nearby
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Towns & cities Ambleteuse
France · under 1 km
Commune in Pas-de-Calais, France
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Towns & cities Audresselles
France · 2 km north
Commune in Pas-de-Calais, France
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Towns & cities Wimereux
France · 4 km south
Commune in Pas-de-Calais, France
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Landscapes & nature Grand Site des Deux Caps
France · 7 km north
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Landscapes & nature
Cap Gris Nez
France · 7 km north
Cape in northern France
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Towns & cities
Boulogne-sur-Mer
France · 9 km south
French commune in Pas-de-Calais, Hauts-de-France