These are the hardest, the highest, and the most challenging pursuits that athletes around the world aim to tame. https://on.natgeo.com/2SnqhZ8

These are the hardest, the highest, and the most challenging pursuits that athletes around the world aim to tame. https://on.natgeo.com/2SnqhZ8 

https://twitter.com/NatGeoTravel/status/1078085656042242048