The Schwerer Gustav, the largest artillery gun ever constructed. Designed by the German arms manufacturer Krupp in 1934, this giant railway gun weighed 1,350 tonnes and measured 47.3 meters in length. Intended to devastate the Maginot Line during the invasion of France, it boasted an 80-centimetre caliber and could fire 7-ton shells over a range of 47 kilometres! | Simple History