Cannons!~

In History there is only one cannon that I can think of that can be considered the greatest cannon of all time. This cannon was created specifically to bombard London during WWII and was considered 1 of the 3 most special projects that the Germans of encountered. That cannons name was called The Gustav Gun.



The cannon weighed 1,350 tonnes was 43 M in length and 7.1 m in Width.
Its barrel length was an astonishing 32 m!!!

Unbelievably they made several of these huge cannons but at the end of the war were later dismantled.

Anyway you can see that this cannon can cause massive destruction wherever it befalls but there are reasons to its success.
If you can see from the image it has a long barrel that narrows, this is to help force the energy which is the combustion of the cannon to exert as much force to increase the acceleration of the projectile. I'm sure there is more technical things about this cannon but since it was a destructive war machine I was not able to find much specifics on it.



A shell of the Gustav cannon compared to a Russian tank.