The National Park Service is clearing up any misconceptions on whether wildlife is migrating away from Yellowstone National ...

"The discovery emphasizes the dynamic nature of Yellowstone's thermal activity," Yellowstone Volcano Observatory's Mike ...

The stunning natural beauty, abundant wildlife, and fun outdoor recreation of Glacier and Yellowstone render them two of America's most popular national parks, which can lead to issues with crowds.

Going to a popular destination doesn't have to mean you'll be overwhelmed by crowds -- as evidenced by this breathtaking trail leading to a geyser.

Yellowstone became the first national park in the U.S. on March 1, 1872, and it helped usher in the broader national park movement. The park stretches into Wyoming, Montana, and Idaho.

Yellowstone National Park is one of the largest and best-known parks in the country, covering nearly 3,500 square miles in Wyoming, Montana and Idaho.

Old Faithful in Yellowstone National Park, Wyo. Old Faithful erupts to a height of more than 100 feet every 66 to 80 minutes, although occasionally the wait stretches to two hours. AP June 28 ...

Yellowstone National Park, Wyoming: A firefighter knocks down a hot spot in the forest outside of Canyon in Yellowstone National Park, Sept. 6, 1988. (Getty Images/Bettman) 103.

Yellowstone National Park celebrates its 150th anniversary on Tuesday. The 2.2 million acres that span Wyoming, Montana and Idaho have transformed from a wilderness to an attraction that millions ...