A
German railway cannon used during World War II. The Dora cannon had a bore of 800mm and fired high explosive shells that were disigned to penetrate several meters
deep into any surface. This cannon was cabable of knocking out ammunition storage areas
deep under ground. This cannon was so large that it had to run on
two sets of tracks, and it could only be turned when there was a turn in the tracks (the gun did not have a turret or similar device). The Dora cannon no longer exists. When the Allies found it, it was in pieces.