I find the science and history of so-called "super guns" very interesting, and this article was no exception. Disappointed only slightly there wasn't more on the background of these weapons, such as the Nazi V-3 Cannon: https://en.wikipedia.org/wiki/V-3_cannon

If that's piqued your interest, you might also be interested in disappearing down the tangential rabbit hole that starts off with reading about Schwerer Gustav: https://en.wikipedia.org/wiki/Schwerer_Gustav