There's a cool site I heard about on an NPR science program: http://www.archive.org/web/web.php. It's got a function called "The Wayback Machine," named after a Saturday morning cartoon, "Sherman and Peabody," about a boy and his dog who go back in history and help historical figures get it right. :-) If you plug in "watchtower.observer.org" in the search box, you'll get a snapshot of the site in various years, from 1998 to 2005.
Cathy