Situated between Navajo and Hopi tribal lands, this stunning canyon offers a mix of colorful hoodoos, remote trails, and ...

The Canyon's Age Sparks Fierce Scientific Debate Scientists have spent over a century arguing about when the Colorado River first carved through the Colorado Plateau. A diverse set of geologic studies ...

The Grand Canyon can get a little crowded if you go to the most popular areas. This hidden gem of a trail offers all the ...

Hike through secret slot canyons, spot endangered California condors, visit sacred Navajo sites, and kayak a stunning 10-mile ...

Rocks gathered along the Colorado River contained evidence of a bustling community of animals in an ancient sea. Scientists recovered dozens of fist-size Cambrian rocks estimated between 502 million ...

Roughly a half-billion years ago, a minuscule penis worm armed with a retractable spiky mouth crawled around prehistoric Arizona. After eons fossilized inside a rock, the newly identified species was ...

About 500 million years ago, the Grand Canyon was a great sea, and among the creatures it harbored was a newly discovered type of penis worm, armed with many rings of teeth. Penis worms are marine ...

I’m not usually one to get weepy over a hotel, let alone a patio and some rough-hewn wooden furniture. But when Arizona’s famous Grand Canyon Lodge and a number of smaller adjacent structures burned ...