This Soviet technology magazine has some of the loveliest artwork I've ever seen. I can't find a whole lot of information about it, since the original poster is Russian (and Google Translate is especially goofy with Russian).
These visions of the future are fascinating. There's the totally cliché vision of flying cars, but I'm intrigued by some of the other ideas, such as:
The Underground Kremlin:
The flying stadium:
My beloved Golem. I never cease to be entertained by the Jewbot:
The Soviet vision of a united global politik:
My favorite, because it's just a damn beautiful drawing:
Check out the original post for tons more.