Vintage Posters from the Golden Age of Travel 1910-1959 BrainPickings' page of vintage poster art pertaining to travel.
Travel Posters — a Flickr set from the Boston Public Library. "Combining superb illustration and hand-drawn typography, they produced dazzling images in rich vibrant colors rendered through the magic of stone lithography." (via)
Follow the Sun: Australian Travel Posters 1930s - 1960s.
Graphic Design from the 1920s and 1930s in Travel Ephemera. Amazing collection of posters, road maps, steamship and airline timetables, (more timetables here), post cards, luggage labels (more labels here and here), brochures and more. Seeing this stuff makes me wish I had been born seventy-five years earlier (and with an obscene amount of money.) (Warning: the site is seriously painful to look at, but the content's good. Link via Coudal.)