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Historic Castles & Forts

Discover the strategic maritime history of the Channel Islands through its diverse coastal defenses. This collection includes Guernsey’s Castle Cornet and Jersey’s Elizabeth Castle, both historic tidal strongholds. The list also features the unique Martello tower of Fort Grey, known as the "cup and saucer," and Alderney’s 19th-century Victorian fortresses, Fort Clonque and Fort Tourgis. These sites span centuries of military architecture, from medieval island castles to the extensive fortifications built to monitor the English Channel.