Admiralty M-N Scheme
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'The Admiralty M-N Scheme' was a World War I British plan to close the Strait of Dover in the English Channel to German U-boats, by means of a chain of either eight or twelve massive towers linked by
British poster made during the 1917 U-boat crisis
The Nab Tower
Coastal defence and coastal fortification are measures taken to provide protection against military attack at or near a coastline, for example, fortifications and coastal artillery. Because an invadin
Castillo San Felipe del Morro in Old San Juan, Puerto Rico
Castillo San Felipe de Barajas in Cartagena de Indias, Colombia
Ottoman fortification and redoubt of the Dardanelles Fortified Area Command during World War I
Suomenlinna, a sea fortress from 18th century in Helsinki, Finland