Internet changes all the time. Thousand of sites appear and disappear. Those sites that survive go through plenty of changes. Wouldn’t it be cool to see those old or retired versions? Internet Archive Wayback Machine maintains a backup of Internet you can look at.
What it does
Wayback Machine crawls Internet and archives all sites it sees (excluding those that have settings forbidding spidering and archiving of content). Archives are processed, sorted by date and accurately stored. With completely free access you can take a look at how any archived site looked in the past.
Unlike search engines that aspire for near-realtime updates Wayback Machine takes time. After site gets crawled it will take months for it to be processed and included in archive.
Proejct does work that doesn’t seem real. However it works, works fine and offers you excellent research tool.