They are some of the world’s largest theme parks, boasting some of the most extreme rollercoasters on the planet.

And with just six days to go until the end of the world, if you heed the warnings of some believers, there is just about enough time to visit one of America’s famous Six Flags theme parks.

Yes, it is now less than a week until the end of the Mayan calendar.

And certain groups believe that date – December 21 – will be a fatal one for planet Earth.

So with time running out, take a trip to California to tackle the 255ft Goliath at Six Flags Magic Mountain, or brave the world-renowned Superman ride at Six Flags America, in Maryland.

Or, if white-knuckle rides aren’t your thing, Six Flags also own six waterparks across America – a different one for every day we have left on Earth.

So why not take in the thrills and spills of Six Flags – before we are all six feet under?