Watch this video of base jumpers in America
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Huge base jumping event in America

20 October 2013 Last updated at 12:28 BST

Not something you'd try unless you've got a strong stomach... and a head for heights.

Adrenalin junkies from around the world have gathered in West Virginia in America to take part in the annual Bridge Festival base jumping event.

The thrill seekers are flung from more than eight hundred feet up with only parachutes to get them down safely.

Over 450 people took part and 90 thousand spectators looked on, feet firmly on the ground.