Two immense canyons on the moon's far side that rival Earth's Grand Canyon were produced by a cataclysmic collision nearly ...

New research shows that when an asteroid slammed into the moon billions of years ago, it carved out a pair of grand canyons ...

A midair collision at the Grand Canyon killed over 100. The disaster partially led to the start of the FAA and changed air traffic control laws.

Ann Houghton, a 73-year-old hiker, was found dead in the Great Smoky Mountains National Park after going missing over the ...

Projectiles flying faster than bullets from a blast 130 times bigger than the global nuclear stockpile helped form giant lunar canyons, according to a new study.

Grand Canyon adventure travelers will have one less ... REI had Signature Camps near Bryce Canyon, Zion and Great Smoky Mountains national parks. At each camp, REI offered lodging in tents with ...

The Vikos Gorge, a wonder of the natural world in Greece, is known as the "Greek Grand Canyon" because of its cliffs and ...

Havasupai elders fight to protect sacred Red Butte Mountain as uranium mine begins hauling ore past ancestral lands near ...

Lake Havasu and the London Bridge are uniquely Arizona road trip destinations. Here's why it's worth the drive and what to ...

The Colorado River is the main artery of the Southwest. Find out how drought and climate change are impacting the river's waters.