Arizona's magnificent Grand Canyon is painstaking result of the Colorado River's current wearing away the planet's surface ...

Each year, millions of visitors marvel at the geological intricacy and beauty of the vast chasm of the Grand Canyon carved ...

The lunar canyons Vallis Schrödinger and Vallis Planck are extraordinarily deep, and scientists now know the valleys were ...

A region north of the Grand Canyon is riddled with mysterious spots and the expert came up with the most probable cause of it ...

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

Grand Canyon adventure travelers will have one less option for planning activities. REI Co-op announced on Jan. 8 that it will close its Experiences business after 40 years to focus on its retail ...

"Whereas Arizona’s Grand Canyon was carved by water over the last 5 to 6 million years and from integrated paleocanyons that ...

The 1956 collision over the Grand Canyon killed more than 100 people. At the time, it was the deadliest civilian plane crash and it remains one of the worst in U.S. history. Here's everything you ...

A trip to Las Vegas wouldn't be complete without experiencing the awe-inspiring natural wonders just outside of it — particularly the Grand Canyon. We've rounded up the best Grand Canyon tours ...