Explore this little-known canyon in Iowa. Home to intriguing caves, miles of trails, and diverse wildlife, this is one of the ...

With 1,000 full-time employees out, and the fate of thousands more seasonal workers unclear, tours are being canceled and some wonder who will empty the trash.

With 22 national parks and monuments to its name, Arizona boasts some of the most astonishing landscapes in the country, from the Grand Canyon to the towering buttes of Monument ...

What we know about southern Arizona bats that tested positive for a fungus tracked by the Arizona Department of Game and Fish ...

Grand Canyon National Park visitors are being warned about long entry lines after Trump administration layoffs hit Arizona’s ...

Two Grand Canyon-size features on the far side of the moon were likely formed in about 10 minutes after an unknown object slammed into the moon 3.8 billion years ago.

Happy Statehood Day, Arizona. From Stevie Nicks and the Colorado River to creosote and Camelback Mountain, here's why we love ...

At about 8 a.m., February 10, emergency crews at the Grand Canyon were notified of a report of a broken rock wall and ...

The body of a California man, a car, and various car parts were found 1,000 feet below Grand Canyon's South Rim.

Happy Statehood Day, Arizona. From Stevie Nicks and the Colorado River to creosote and Camelback Mountain, here's why we love ...

A new study explains how two deep canyons formed very quickly on the moon during an asteroid impact. KNAU’s Melissa Sevigny ...