If you are interested in what a particular web site used to look like, you can use the Wayback Machine website to help. It shows a calendar and you pick the date you wish to see what the site looked like. I mentioned this last year, but thought it was worth mentioning again.
Some get around it and the pages are no longer available. For instance, I was looking up some info from the Obama campaign where he answered questions that were sent in. The pages have all been replaced with a page that sends you to the whitehouse.gov site. LINK Seems the answers from back then might not be the same today and we might be confused. However, I did manage to find a way to the original site by another means.