Gustav Cannon. Largest gun ever built before being (literally

Schwerer Gustav: Largest Gun Mankind Has Ever Built

Finished LoK for the first time the other day and noticed that this weapon was based on Schwerer Gustav - a real-life railway gun from WWII. : r/TheLastAirbender

Would a giant Cannon, like the Schwerer Gustav be useful in the modern day? - Quora

Schwerer Gustav: Largest Gun Mankind Has Ever Built

The largest cannons in history. 520-mm railway howitzer Obusier de 520 modele 1916

Schwerer Gustav: Hitlers Enormous Gun

What's the biggest caliber cannon ever mounted on an armored vehicle like a tank? - Quora

Where is Schwerer Gustav (an 800 mm German railway gun) now? - Quora

The UnMuseum: Schwerer Gustav - World's Biggest Gun

Where is Schwerer Gustav (an 800 mm German railway gun) now? - Quora