Not sure if anyone posted these before, but I thought they are really cool. Like the kind of travel posters from the 1920s and 30s for railroads and ocean liners. Amtrak has retro posters like this today in train stations. Love this kind of art, and the posters themselves really bring me back to when I thought I'd be doing this someday:
http://www.jpl.nasa.gov/visions-of-the-future/
Some samples:
http://www.jpl.nasa.gov/visions-of-the-future/
Some samples: