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. 1882 (MDCCCLXXXII) was a common year starting on Sunday (see link for calendar) of the Gregorian calendar or a common year starting on Tuesday of the 12-day slower Julian calendar. ... To meet Wikipedias quality standards, this article or section may require cleanup. ...
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. The Tyne Turrets are 2 12 guns from HMS Illustrious sited in WWI batteries at Hartley, near Seaton Sluice north of the Tyne, and Marsden near Lizard Point south of the river. ...