Tankies! Dora (Schwerer Gustav) and Karl-Gerat by xSamiamrg7x on DeviantArt

Krupp 80 cm Kanone Schwerer Gustav (Dora) Railway Gun

Schwerer Gustav, Wiki

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

Shell, 80 cm (Schwerer Gustav), with aerodynamic cap

Artillery Ammunition Comparison

Artillery shell round hi-res stock photography and images - Alamy

This is original ammunition railway wagons for Schwerer Gustav, displayed in czech republic : r/ww2

Schwerer Gustav, largest rail cannon in the world

What is the heaviest shell that can be fired from an artillery piece (not including ballistic missiles or rockets)? - Quora

80cm Schwerer Gustav/Dora case and projectile - General Ammunition