They are among nature's most in incredible wonders – huge, delicately balanced rocks that look like they're about to topple over at any moment. Some may last for thousands of years but the lifespan on some of the selection we have below, one suspects, is going to be a little bit shorter. Are you ready to rock and roll?
Balanced Rock Park, USA
I wouldn't stand there if I were you
© Gerry Slabaugh
Over 15m tall and weighing 40 tons, this wind-carved rock balances precariously on a pedestal only 1m by 43cm. No, we wouldn't want to stand there for too long.