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 ...

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

(CNN) — About 3.8 billion years ago, two massive canyons likely formed on the moon in a span of less than 10 minutes, according to new research. The extraordinary formations, each comparable in size ...

SELIGMAN, AZ (AZFamily) — Twenty-one stories deep and about a mile off of old Route 66 sits the Grand Canyon Caverns. Formed over 15 million years ago, they were discovered in 1927, and tours began in ...

We’d barely managed to snag the last few deck chairs on the back patio of the Grand Canyon Lodge on the North Rim. Sunset was still an hour away; I’d brought a book and was content to read while ...

Most visitors to the Grand Canyon's North Rim went no further than the lodge, but they didn't have to. The rustic lodge, with its wall of windows, drew new visitors and welcomed seasoned hikers ...