I seem to remember there was a website where you could view other websites from. Does anyone know its address?
The idea being that maybe your own firewall blocked a URL. So you go to this site, enter a URL and it displays your requested URL in an iframe. The net effect is your are viewing the site as though you had gone their directly but actually you are viewing it in an iframe.
What you're looking for is called a proxy. Just google proxy or web proxy and you'll find many such options.
For example: Hide My Ass! Free Proxy