Robben Island Prison Museum: WWII Gun Enplacement

Two huge guns were built to provide protection for the entrance to Cape Town harbor in 1928. They were capable of firing a 385 pound projectile up to a distance of 32 kilometres (20 miles). Originally built on Cape Town's Signal Hill, the guns shattered windows for several miles around when fired, and were accordingly moved to Robben Island. The South African navy retained control of Robben Island until 1958.