Gene Healy has some great remarks on Saddam’s Supergun (“the barrel alone would have been 512 feet long and weighed 1,665 tons”): 

I’m with Lt. Col. James A. Howard, quoted in the article after visiting the site: “I think a gun this big would be kind of dumb.” You could say the same about the sort of tin-pot totalitarian who would build it. And about people who still insist Saddam was a threat. ~Gene Healy