"Reprimanding doesn't work." Bystanders dumbfounded by national park visitor's bizarre behavior: 'They need to be arrested' ...

Already this summer, several park visitors have been caught disregarding federal regulations put in place to both protect ...

Other Yellowstone visitors were horrified Monday as they watched a man in flip-flops walking off the board walk onto the ...

Looking for the best things to do in Yellowstone National Park? From famous geysers to hidden hot springs, here are some ...

Members of Montana’s congressional delegation have introduced bicameral legislation implementing a presidential order that will charge international visitors to America’s national parks an additional ...

At 250-by-300 feet and up to 160 feet deep, the Grand Prismatic Spring is the largest hot spring in the USA. Its brilliant colors are the result of pigmented bacteria living on its perimeter.

The Grand Prismatic Spring of Yellowstone National Park is the largest thermal spring in the US and the thirds largest in the world. But the sheer size of this 61-100 meter (200-330 feet) wide ...

Reporting from — Of course you’ll do Yellowstone’s Old Faithful. But you also should head 7 miles north and visit Grand Prismatic Spring. It’s the largest spring in the park, about 300 ...

Grand Prismatic is known for the bright multi-hued algae and bacteria coloring its edges, and the deep blue color at the center of its approximately 200-foot-wide pool. Visitors aren't allowed to ...