Schwerer Gustav: Germany, World War II, Siege Engine, Krupp

File:Schwerer Gustav Grenade.JPG - Wikimedia Commons

Trivia: Gustav Max was based on Schwerer Gustav, the rail cannon made and used by the nazi germany, also considered the largest gun ever used in a war. : r/DuelLinks

Schwerer Gustav, Wiki

Dora/Schwerer Gustav K. (E) Rail Gun, World War II Wiki

File:DoraSchwererGustav.jpg - Wikimedia Commons

Railway gun - Wikiwand

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

What happened to the Gustav Gun after WWII? - Quora

File:800 mm gun gustav in Soviet Union 1941.jpg - Wikimedia Commons

Large-calibre artillery - Wikiwand