If you're looking for the ultimate outdoor photo spot, Utah has vibrant purple mountains - and they're near the state's mini" Grand Canyon too!

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.

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

Located in Arizona, the Grand Canyon is currently 446 kilometers (277 miles) long, spreads up to 29 kilometers (18 miles) wide, and has a depth of up to 1.8 kilometers (1.1 miles).

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.

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

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

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

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 ...