Historic fortifications in Guernsey

Spanning centuries of military history, the fortifications of Guernsey and Alderney reflect the strategic importance of the Channel Islands. This selection includes the medieval stronghold of Castle Cornet and 19th-century Martello towers like Fort Grey. The collection also features extensive German coastal defenses from the World War II occupation, such as the naval signals headquarters and converted observation towers. These sites offer insight into evolving defensive architecture, from tidal island fortresses to reinforced concrete bunkers.