Arguably the most incredible search engine online is the Internet Archive - it allows time travel! This incredible database has crawled the Web since 1996. It hold more than 150 billion (!) web pages. You can recover Web pages from a decade ago - news items - track the development of a Web site over years.
For example, enter http://www.uis.edu into the Wayback machine and see how the UIS home page has changed since 1996.
You can restore broken links to material that has been removed from the Web. There are special sections for moving images, text, audio, software and education. And, there are special collections for historic events. This is an awesome resource.