280mm Kanone 5 Eisenbahn (Railway).Of the 25/28 made, only 2 are left ! The other one (Anzio Annie) is in the Aberdeen Proving Grounds in USA.   View of the Ammunition hoist.I think by the angle of the holes, the damage is a result of Air attack!

Close up of damage.   These guns where first in service in 1936,it is in remarkable condition considering it is nearly 65+ years old!