Outside Mexico's capital, snowcapped volcanoes offer a guided challenge to mountain climbers pushing for new altitude goals https://on.natgeo.com/2k9nLGg

Outside Mexico's capital, snowcapped volcanoes offer a guided challenge to mountain climbers pushing for new altitude goals https://on.natgeo.com/2k9nLGg 

https://twitter.com/NatGeoTravel/status/998247063589675008