The Kjeragbolten boulder on Kjeragin Rogaland, Norway

Hang in there. Kjeragbolten boulder on Kjerag in Norway

If you have nerves of steel, you’ll enjoy the unusual and precarious photo opportunity presented by the Kjeragbolten boulder. Visitors climb up Kjerag, a mountain on Norway’s south-west coast, to clamber onto the stranded rock and have their daredevil picture snapped for posterity. Indeed, Kjeragbolten is so popular, you might have to wait an hour for your turn - plenty of time for second thoughts and cold feet.

So how did Kjeragbolten become wedged in a crevice on Kjerag, over a clear 791ft drop? Experts say that, after millions of years of glacial activity, the ice finally receded to the valley, leaving the famous rock in the mountain’s grip. Today, this piece of geological history attracts adventurers and steady-handed photographers. If adrenaline rushes aren’t your thing, don’t worry: The mountain itself offers perfectly safe, breathtaking views of the valley and fjord below.