From jetpacks to flying cars, our cultural psyche is filled with dreams of a technological future that never quite became reality. Never was this more true with the vision of Michigan's Bohn Aluminum and Brass Corporation. Business Insider has a collection of advertisements the company produced in the 1940s, promoting the utility of its aluminum, magnesium, and brass alloys in a retro-future world of rockets, massive transports, and three-story-tall tankers. From the swooping lines of the vehicles themselves, to the broad vision of a peaceful world of monorails and skyways, it's a look back at an utopian future we once thought was within our grasp.