Nevada's extra terrestrial highway(Laura Rauch_PA)

It's not, admittedly, the kind of travel that you might tell your friends about. But, with recent alien road trip movie Paul, mysterious orbs being sighted over Jerusalem and Stephen Hawking's ringing endorsement that aliens do exist, believing in extraterrestrials may not be the social kiss of death it once was. In fact, the International UFO Congress is taking place in Arizona this week, attended by astrophysicists and military personnel - not just conspiracy theorists.

Like patrons of a favourite pub, ETs seem to have a habit of returning to the same places, manifesting in odd, unexplained activity (not caused by a flashlight or laser pen, thank you, sceptics). So, as crop circle season begins in the UK, grab your tinfoil hat and beam up for our top secret picks of the world's alien hotbeds...