This WWI-era invention offers less-seasoned adventurers the opportunity to explore terrain usually reserved for experienced mountaineers. https://on.natgeo.com/2k7S5EP

This WWI-era invention offers less-seasoned adventurers the opportunity to explore terrain usually reserved for experienced mountaineers. https://on.natgeo.com/2k7S5EP 

https://twitter.com/NatGeoTravel/status/1150963288618000385