Fountain Paint Pot Trail in Yellowstone National Park is an amazing ... the mud pots can be thin and watery from winter rain and snow. Later in the summer and in the fall, the mud pots are thicker.

It’s no secret that Yellowstone National Park can ... and gurgle of flaring fumaroles and bubbling mud pots, and the quiet crunch of snow underfoot. Winter weather varies from blue-sky days ...

Editor’s Note: This story accompanies the May 2016 issue of National Geographic magazine, devoted entirely to America’s first national park. Find more at natgeo ...