17/05/2024
A British BL 18-inch Mk 1 naval gun being moved into the Imperial War Museum in Crystal Palace, London. This gun is a wooden mock-up, but the real thing weighed 150 tons. The Mk 1 was the largest British naval gun ever made, and the second largest ever, with only Japan's later 18.1 inch guns surpassing it. The guns were designed for HMS Furious, but were later installed on monitors in single-gun turrets. One of these guns has the record for the longest-range Royal Naval engagement when it fired on German positions inland 33,000 meters away during WWI.
Yamato had this gun beat, with 18.1 inch guns: https://navalhistoria.com/the-battleship-yamato/