Add Yahoo as a preferred source to see more of our stories on Google. Ever been mesmerized by the swirling colors of Grand Prismatic Spring and wondered what fuels that otherworldly boil? It turns out ...

The Grand Prismatic hot spring in Yellowstone National Park is sourced from a magma chamber beneath it. The bright colours are produced by hydrophilic bacteria in the mineral-rich water. Disclaimer: ...

Onlookers at one of Yellowstone National Park's most popular sites watched a large bison take its final steps into a scalding hot spring and die in a horrifying reminder of what can happen away from ...

Visitors are supposed to stick to designated walkways around thermal features at Yellowstone National Park. It’s not just for their own safety or the protection of the park’s famed, fragile resources.