The Library of Congress is well known for its extensive catalog of historic images from around the world, many of which are available for public use online and free of any known copyright restrictions. These turn of the century postcards kick it up a notch.
Their collection of photochrom travel images dating from the 1890s to 1910s features locations all over Scandinavia, including Norway, Sweden, and Denmark, that are rich with color and a sense of historic wanderlust. The originals, souvenir prints or ink-based photolithographs, were collected by travelers in their day and are now richly prized by artists and graphic designers. Thanks to the magic of technology, these travel photos are now available for public consumption via Flickr and the Library of Congress website.