Kjeragbolten boulder, Kjerag mountain, Rogaland, Norway

© Angel FAyE/Getty Image

Kjeragbolten boulder, Norway

If you’re feeling brave, you might enjoy standing on the precarious Kjeragbolten boulder. Visitors climb up Kjerag, a mountain on the south-west coast of Norway, for the chance to clamber onto the stranded rock and have their picture taken. The rock is so popular that you might have to wait an hour for your turn – plenty of time to turn around if you’re having second thoughts.

So how did Kjeragbolten become wedged between two rocks on Kjerag mountain, suspended above a 984-metre deep abyss? 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 the piece of geological history invites brave adventurers and photographers. If adrenaline rushes aren’t your thing, don’t worry: The mountain itself offers safe, breathtaking views of the valley and fjord below.