Geologists have uncovered compelling new evidence that reshapes the understanding of Hells Canyon, America’s deepest river ...

About 2,000 feet deeper than the Grand Canyon, Hells Canyon was rapidly carved when a lake spilled over about 2.1 million ...

Ocracoke Islanders Tom and Carol Pahl are on a trek around the United States (following 70-degree weather) and will report back from time to ...

Artists and an astronomer who spent time at the Grand Canyon share their thoughts on the importance of public lands.

The caverns sit atop the Grand Canyon Inn between Peach Springs and Seligman and are a worldwide tourist attraction.

Tribal lands, such as those belonging to the Havasupai, Hualapai, Navajo and Hopi Nations, require special permits for access ...

The Cambrian-age Tonto Group is a set of rocks famous for holding clues to the burst of new life that reshaped Earth 500 ...

Beneath the Grand Canyon’s iconic layers, scientists have uncovered a fast-paced, 500-million-year-old tale of evolution that ...

In the 19th century, many people believed that landscapes like the Grand Canyon were shaped by volcanoes and earthquakes. But one American geologist named John Newberry had different ideas.