Internet archives and caches - some ideas for going back in time

When links are broken (for PDFs, ISOs, installers) you can try to look for and use the cached version by Google (on the drop-down menu to the left of the link there is a "Cached" menu entry). That is why it is said: "Once in the Internet, forever in the Internet".

For HTML sites, there's a way to "travel back in time".
For example to see several home pages of CNN, or PCMagazine you can use the Internet Archive site (that contains a slider that allows you to choose the date):

home - PC Magazine

Powerful, useful and interesting, ain't it?