is a great collection of hundreds of old circus posters predominantly from Europe and the United States. The site is in Dutch so I don't really know much about the collection itself or where the posters came from but the art is really neat. Many of the posters are from the early 1900s and have a really great authentic look to them. The posters a separated into categories like Clowns, Acrobats, Magicians, Jugglers and my favorite, Freaks. If anyone speaks Dutch, maybe you could check out the website
and let me know a little more about the project.