This 24-year-old man took more than two years to prepare to climb the world's hardest cliff in 20 minutes
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A man climbed the world's hardest cliff in 20 minutes
Adam Ondra, a 24-year-old professional climber, managed to climb what is considered by many climbers the wold's hardest cliff, the granite cave in Flatanger, Norway.
5:21 PM - 26 Oct 2017
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