Admiralty Pier Turret
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Dover Turret, also known as the Admiralty Pier Turret, is an enclosed armoured turret built in 1882 on the western breakwater of Dover harbour. It contains 2 × 16", 80-ton guns, the biggest installed in the United Kingdom.
Declared obsolete in 1902, it is currently part of the port and inaccessible, though the guns remain in place.
Another example of very heavy armament of the period are the Tyne Turrets.