In 1908, explorer G.E. Kincaid made a shocking discovery in the Grand Canyon: a man-made cavern with hundreds of carved steps ...

Two gargantuan canyons on the moon were carved by a hailstorm of rocks — and that’s good news for future lunar astronauts.

Something unusual is happening in the Grand Canyon—its animals are behaving in ways never seen before. From unusual ...

The Earth's Grand Canyon took millions of years to carve, but the moon's grand canyons took about ten minutes.

The man who led a landmark attempt to navigate the entire length of the Grand Canyon did not exactly look ... This is the mystery of risk: What makes some humans willing to jeopardize so much ...

A 29-year-old man from Ireland died on Wednesday from injuries sustained the previous day in a fall at the Bansko mountain ...

On March 31, Diana Zacarías, a 22-year-old from Natchitoche, Louisiana, arrived in Arizona to make a dream come true: visit the Grand Canyon. From the very beginning, it seemed an adventure that ...

The Mystery of Chaco Canyon is available to stream on pbs.org and the free PBS App, available on iPhone, Apple TV, Android TV, Android smartphones, Amazon Fire TV, Amazon Fire Tablet, Roku ...