Landkreuzer P. 1500 Monster

The Landkreuzer P 1500 Monster was a purported German pre-prototype super-heavy self-propelled gun designed during World War II. While it is mentioned in a number of popular works about World War II projects, there is no solid documentation for the program’s existence, and it may have only been a semi-serious proposal, or even an outright hoax, much like the Panzer IX and Panzer X. == Development == On 23 June 1942, the German Ministry of Armaments proposed a 1,000-tonne tank—the Landkreuzer P. 1000 Ratte. Adolf Hitler expressed interest in the project and the go-ahead was granted.

Source: Wikipedia — Landkreuzer P. 1500 Monster (CC BY-SA 4.0)