HTML site navigation without loading

I've found a really interesting effect on a site recently and wondering how to replicate. The site in question is http://ift.tt/1hqMfY0.

When you navigate around the site the meta tags and URL change but there is never any page loading, does anybody know how to replicate this?

The easiest way I can think of would be to create a single page application, but I wasn't aware it was possible to create a single page app that gave the impression of being multi page (meta tags changing etc.)

Thanks in advance, James