It’s a journey that starts two billion years ago, when the basement rocks that make up North America were forming—and so were a few of our favorite parks. https://on.natgeo.com/2DVgmWk

It’s a journey that starts two billion years ago, when the basement rocks that make up North America were forming—and so were a few of our favorite parks. https://on.natgeo.com/2DVgmWk 

https://twitter.com/NatGeoTravel/status/1069259945802117120