The largest museum naval guns seen in person

What is the largest gun you have seen in person?

Probably the naval guns outside the Imperial War Museum, with other large ordnance also displayed at IWM Duxford.

The largest guns recalled are the naval pieces displayed outside the Imperial War Museum, with other substantial ordnance at IWM Duxford. A large cylindrical object near the Cornish site where HMS Warspite ended her career is also mentioned. That object could not be inspected closely without trespassing, so it cannot be identified as a gun. Museum collections and surviving maritime sites offer different ways of encountering naval artillery.