Sotheby's is putting some rare items up for auction, including what it calls the largest piece of Mars ever found on Earth.

By trapping trillions of gallons of water behind nearly 7,000 dams since 1835, enough to fill the Grand Canyon twice, humans have redistributed the planet’s mass enough to cause a phenomenon known as ...

A dinosaur fossil has been found in an unlikely way in an unlikely place, a hole drilled under the parking lot of a Colorado ...

A hiker has died on the South Kaibab Trail in the Grand Canyon National Park while attempting to reach the Colorado River.

From unexplained phenomena to baffling disappearances, follow the clues while discovering our country’s treasured protected ...

A 67-year-old Texas man died Tuesday at the Grand Canyon after abandoning an attempt to hike down to the Colorado River. He turned around and began ascending toward the rim before he was found, ...

A 67-year-old Texas man died Tuesday at the Grand Canyon after abandoning an attempt to hike down to the Colorado River. He ...

The NPS recommends avoiding hiking the Grand Canyon's inner trails between 10 a.m. and 4 p.m., when temperatures are at their ...