A bison in Yellowstone National Park appeared to stumble into the scalding water of Grand Prismatic Spring, causing its death as tourists looked on during the park's busiest season. The bison fell ...

Yellowstone National Park feels like a living Earth museum, where bubbling geothermal wonders, sweeping valleys full of ...

Yellowstone Caldera Chronicles is a weekly column written by scientists and collaborators of the Yellowstone Volcano Observatory. This week's contribution is from Michael Poland, geophysicist with the ...

MAMMOTH, Wyo. (AP) — Actor Pierce Brosnan, who pleaded guilty Thursday to stepping off a trail in a thermal area during a November visit to Yellowstone National Park, was caught after posting pictures ...

The breathtaking beauty of Yellowstone National Park and its stunning hydrothermal features may have you exclaim: "Hold on to your hats!" The U.S. Geological Survey asks you to take that literally.

Yellowstone National Park’s Morning Glory Pool is not what it used to be. Back in the 1800s, the famous hot spring was a bright, clear, turquoise blue, and it was named after the flower it resembled.

When Leonard Nimoy flew to Yellowstone in August 1978 to shoot a scene for "Star Trek: The Motion Picture, " Mammoth Hot ...