More people have orbited the Earth than have hiked the Grand Canyon from end to end—that's how expansive it is http://on.natgeo.com/2AHAydz

More people have orbited the Earth than have hiked the Grand Canyon from end to end—that's how expansive it is http://on.natgeo.com/2AHAydz 

https://twitter.com/NatGeoTravel/status/935704928873480192