Schwerer Gustav - Hitler's giant gun - How it worked and why it turned out to be a disaster

The Gustav gun was a gun about 12 meters high, 47 meters long, weighing 1,350 tonnes and was firing 10 tonnes shells through a 30 meters long pipe. 22 people could sit aligned on the barrel of the gun.

These are the 6 largest guns ever used in combat

WW2 German Assault Guns Archives - Tank Encyclopedia

Was the Gustav gun successful, and was it destroyed? If it was, how? - Quora

Steam Workshop::Schwerer Gustav

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The Heavy Gustav, Hitler and generals inspecting the largest caliber rifled weapon ever used in combat, 1941 - Rare Historical Photos

Schwerer Gustav: The World's Biggest Gun Ever Built

Schwerer Gustav: The World's Biggest Gun Ever Built

Schwerer Gustav: Biggest Gun Ever Used in Combat