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A view of the Norris Geyser Basin at Yellowstone National Park on May 12, 2016. Yellowstone, the first National Park in the US and widely held to be the first national park in the world, is known for its wildlife and its many geothermal features. / AFP / MLADEN ANTONOV (Photo credit should read MLADEN ANTONOV/AFP via Getty Images)

A view of the Norris Geyser Basin at Yellowstone National Park on May 12, 2016.
Yellowstone, the first National Park in the US and widely held to be the first national park in the world, is known for its wildlife and its many geothermal features.  / AFP / MLADEN ANTONOV        (Photo credit should read MLADEN ANTONOV/AFP via Getty Images)