Wild river, national river, scenic riverways. Aren’t they all water when you really get down to it? Here’s a National Park Service primer on the different categories of rivers in the National Park System:

Though remotely located in the mountains of northeastern Utah and northwestern Colorado, Dinosaur National Monument goes through days when the air quality is almost as bad as you'd find in major metropolitan areas.

Yellowstone National Park isn't the only national park with bison issues. Far to the south, Grand Canyon National Park officials are trying to better manage bison on the park's North Rim. Actually, they're trying to get the animals off the park's property on the North Rim.

Rebels with a Cause, a documentary that celebrates the people and passion that saved the coastal wonders that would become the Point Reyes National Seashore and the Golden Gate National Recreation Area, is airing on PBS stations this month.