Yes, posters are art -- as you'll see before you even cross the threshold of this extraordinary gallery. It features extensive collections of French, Swiss, Soviet, and Italian vintage posters, and thousands of other posters, including originals from around the world. The accommodating staff will comb its databases (cyber and cerebral) to help you find the exact image you want, and the website is a great resource. The theme of the works on display changes three or four times a year. Prices start at $50, with most between $500 and $2,000.