Today visitors will see several fascinating museums within the castle walls.
Soldiers in uniform fire the noonday gun daily and you might just encounter a character from the past in one of the period gardens!
Look round the Maritime Museum which charts Guernsey's nautical history and the 'Story of Castle Cornet' with its mystery skeleton and the 201 Squadron Museum.
A new museum for 2011 featuring the history of the island's militia from the 1300's to the present day.
The Story Of Castle Cornet
This museum explores the history of the Castle from pre-historic times to the present day.
Housed in the 18th century Lower Barracks building, soldiers of the time lead the visitor into the Castle story.
The vibrant graphics, detailed models and objects discovered during a series of excavations interpret the story, helped by touch screen computers, video technology and special effects.
The Maritime Museum is situated in the 18th century Upper Barracks and traces Guernsey's nautical history from prehistoric times to the present day.
Its fishing industries, ship building and naval history are portrayed through life-sized displays, scale models and museum objects.
A collection of Maritime Art and a section on Safety at Sea complete the display.
201 Squadron Museum
In 1939 Guernsey was affiliated with 201 Squadron. This museum is unique as it is the only squadron museum open to the public.
Re-organised in the 1920s as a maritime unit, 201 served with Coastal Command during the Second World War.
The Squadron's flying boats flew arduous patrols protecting vital supply convoys from enemy submarines.
The story of 201 Squadron's airmen is told through photographs and documents, personal and aircraft relics, models and interactive displays.
The Royal Guernsey Light Infantry Regimental Museum was opened in summer 2009.
Uniforms, weapons, letters and medals tell the story of Guernsey's regiment, in particualr its part in the Battle of Cambrai.
Castle Cornet offers a profusion of plants within its ancient walls, including four 'period' gardens, designed with the help of horticultural expert Peter Thoday.
Lamberts Garden, named after General Sir John Lambert, imprisoned here from 1661-1670, is based on a Tudor Rose design.
The 18th century Governor's Garden, based on a 1735 garden plan in the Castle, has an elegant pattern of beds creating the effect of a tapestry.
The 19th century Master Gunner's Garden reflects the domestic scene of the time.
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St. Peter Port