With over half the world's geysers, Yellowstone offers visitors an incredible opportunity to see geology in action. http://on.natgeo.com/2wovJQz pic.twitter.com/2UJzrB2Moc

With over half the world's geysers, Yellowstone offers visitors an incredible opportunity to see geology in action. http://on.natgeo.com/2wovJQz  http://pic.twitter.com/2UJzrB2Moc

https://twitter.com/NatGeoTravel/status/913901370092261377