If I am correct
they found a Torpedo in Scapa flow, and they secured it and blew it up
another Historical piece just been blown up....
as for Europe, just visit Verdun from WW1, there are parts you cannot walk on because of the danger of Mines, and they have a open air monument where there is a Trench totally covered in sand where the guns still stick out of the ground.
I have visited that place and really its a sad place:
from Wiki:
Among many revered memorials on the battlefield is the "Bayonet Trench", which marks the location where some dozen bayonets (fixed to rifles) lined up in a row were discovered projecting out of the ground after the war. And below each rifle was the body of a French soldier. It is believed that these belonged to a group of soldiers who had rested their rifles against the parapet of the trench they were occupying when they were killed during a bombardment. The men were buried where they lay in the trench and the rifles left untouched.