Now I have some times and here are some exemples for France. You'll find several coastal forts such as the one in Antibes: the "Fort Carré". Some will be found inland also and several fort from WWI surrender Paris.
Carcassone is a good exemple but several other cities (smaller cities for the most part) will have citadels or fortified harbor such as St Malo.
I also put a view of Carcassone and one from two castles
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