In the afternoon, while his crew set up camp for the night, Powell would often climb into the canyon to investigate. Much has been learned about the geology of the Grand Canyon and about the ...

New Mexico's beautiful slot canyon, with its picturesque western views, dramatic white rock formations, and endless horizon, ...

The Grand Canyon's three Inner Corridor trails had to be shut after workers discovered dangerous chlorine gas at the Roaring ...

Although they no longer stand proudly, evidence of their existence can be found in the ancient crystalline rocks at the very bottom of the Grand Canyon. Known as the Vishnu Basement Rocks ...

The Grand Canyon, located in Arizona, USA, is one of the most iconic natural wonders in the world. Carved over millions of ...

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.

Just getting to the overlook is a challenge; the road is unpaved and studded with rocks that require a high-clearance vehicle. (Related: This new park gives different views of the Grand Canyon ...

The Grand Canyon is the biggest canyon on earth: 277 miles long, 10 miles wide, and a mile deep. It contains some of the oldest exposed rock on earth, Precambrian Vishnu schist, formed 1.7 billion ...

The Grand Canyon reminds us constantly that we are merely ... The whole earth story is on display here, right back to the rocks that formed when the molten planet cooled, before life and evolution ...

This story appears in the February 2012 issue of National Geographic magazine. Carry a lawn chair and a sunshade—plenty of water too—onto the sage flats just south of Arizona's Highway 89A ...

The public lands surrounding Grand Canyon National Park contain high concentrations of uranium ore. Mining bores deep into vertical rock formations called “breccia pipes,” making uranium soluble to ...