Unseen mountains, valleys, lakes, and rivers lie under Antarctica’s mile-thick ice sheet. Changes to those hidden rivers could have dramatic global consequences.

One of California's latest national monuments is an enormous, pristine section of mountains, lakes, and lava flows in the ...

Geologically speaking, things are always changing at Yellowstone — especially in hydrothermal areas. It’s simply the nature of the complex hydrothermal system overlying one of the planet’s largest ...

Denver has long been a launching off point for outdoor adventures, but did you know there are 15 national parks near Denver?

At the confluence of multiple tectonic plates, on the Pacific Ring of Fire, sits the West Coast of the United States, where ...