The Grand Canyon is vast, covering 1,218,375 acres and 1,904 square miles across Arizona. Here's what to know.

Many American schoolchildren grow up learning that Yellowstone was the world’s first national park. But across the globe in Mongolia, just south of the capital, Ulaanbaatar, a mountain holds a claim ...

Hayden Valley in Yellowstone National Park is one of two epic wildlife viewing destinations. If you are looking to see ...

Guide to the best hotels and things to do in Yellowstone National Park. Maps, travel tips and more.

Located in a strange lunar landscape of great geological interest, this site has one of the most important groupings of prehistoric cave art in the world. More than 15,000 drawings and engravings ...