Hitler desperately wanted to conquer France. However, the only way to do that was to get through the Maginot Line, a heavily fortified border running along Germany and Italy. Enter the German Gustav and Dora Rail Cannons, the largest cannons ever built. They weighed 1,344 tons and even though they were attached to a rail line, couldn’t be moved for fear of crushing the tracks. They were also hilariously inaccurate and barely saw much any real action. The Gustav was captured, and The Nazis ended up scrapping the Dora entirely so the Soviets couldn’t get their hands on it.