We love it when the web gets used this well. The LoC has scanned in copyright-free photos for everyone to access and use. And they need your help - browse the collection and help out with tagging the images.
Editorial note: Whoa! You've found a super-old post here on BuzzFeed, from an earlier era of the site. It doesn't really represent where we are anymore, and may in fact be totally broken, but we're leaving it up as a part of our early history.