Overholser was last seen at Mather Point on the South Rim on Dec. 10 and believed to have walked west, possibly toward Bright ...

We’re on a cliff roughly 3,500 feet above the Colorado River at the tip of the Great Thumb Mesa, a spectacular formation that thrusts out from the South Rim of the Grand Canyon like the bow of ...

Did the Grand Canyon once harbor ancient Egyptian artifacts and evidence of giants? This video explores the alleged ...

A 66-year-old woman is currently missing, last seen at Grand Canyon National Park, according to the National Park Service.

A team of Smithsonian researchers have stumbled across a lost walled Aztec city guarded by some evil spirits, including a "great flying serpent of death." As days turn to weeks, Susan Jordan ...

A 66-year-old woman never returned to her tour bus at the Grand Canyon National Park in Arizona, rangers said. She’s been missing for over a week. Martha Overholser was last seen Dec. 10 at Mather ...

Long ago, the Grand Canyon wasn’t a land of plunging ravines ... collision between the North American Plate and a since-lost oceanic plate, causing Earth's crust to crumple up, fold, and thrust ...