Home to some of the most unique geothermal features in all of North America, Yellowstone National Park is a true treasure.

A surprise eruption that shot steam, water and dark-colored rock and dirt dozens of feet into the sky Tuesday sent people running for safety in Yellowstone National Park. The hydrothermal explosion ...

JACKSON — The Porkchop Geyser in Yellowstone National Park’s Norris Geyser Basin was once a small hot spring, a blue pool that occasionally erupted. But in 1985 the geyser changed: The Porkchop began ...

Yellowstone National Park's tallest and most infamously unpredictable geyser erupted Monday for the first time since the fall of 2003. Steamboat geyser at Norris Geyser Basin erupted at around 2:40 ...

The geyser Old Faithful was first documented and named on this day in history, Sept. 18, 1870, by the explorer Nathanial Langford. Langford, who was exploring Yellowstone Park as part of the ...

An unusual detective story involves some veteran geologists at Yellowstone National Park, a spectacular geyser that seems to erupt only when no one's around, and two witnesses who stumbled onto an ...