"Yellowstone is not a petting zoo." Yellowstone tourists scolded by park ranger after gathering close to wild bear for photos ...

A detailed look at Yellowstone's magma storage system finds that only one region is likely to host liquid magma in the long ...

14 gray wolves were released in the park. Within only a few years, the wolves were thriving – part, once more, of the larger Yellowstone ecosystem. Explore historical images of the national ...

Sitting atop an active volcanic caldera, Yellowstone, America's first National Park, is home to more geological hydrothermal ...

Yellowstone National Park, known for erupting geysers like Old ... Eve Chen / USA TODAY NETWORK via Imagn Images However, Americans need not panic about waking up under a blanket of molten ash ...

As the headquarters of Yellowstone National Park, the Mammoth Springs Historic District is also home to historic buildings, including structures that date back from the Fort Yellowstone days ...

Yellowstone supervolcano ’s last eruption covered most of what is now the USA in volcanic ash and lava that flowed for ...

Scientists are tracking changes at the giant supervolcano that lies under Yellowstone National Park, but they say there's no need to worry at the moment. “The western part of the Yellowstone ...