Project Babylon was a space gun project commissioned by then Iraqi president Saddam Hussein. It involved building a series of "superguns". The design was based on research from the 1960s Project HARP
Two sections of Big Babylon that have been bolted together at Royal Armouries, Fort Nelson, Portsmouth.
A section of the Iraqi "supergun" from Imperial War Museum Duxford
The formal definition of large-calibre artillery used by the United Nations Register of Conventional Arms is "guns, howitzers, artillery pieces, combining the characteristics of a gun, howitzer, morta