With 22 national parks and monuments to its name, Arizona boasts some of the most astonishing landscapes in the country, from the Grand Canyon to the towering buttes of Monument ...

That's good news for NASA, which is looking to land astronauts at the south pole on the near, Earth-facing side later this ...

The gigantic cataclysm, which released energy 130 times more powerful than the detonation of the entire world’s atomic ...

Our reporter, Anthony, set out to explore the top hiking trails in Texas, sharing tips on how to prepare and where to stay.

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

The lunar canyons Vallis Schrödinger and Vallis Planck are extraordinarily deep, and scientists now know the valleys were ...

Two gargantuan canyons on the moon were carved by a hailstorm of rocks — and that’s good news for future lunar astronauts.

I found big adventure and warm weather in these national-park units spread across the Southeast and Southwest ...

Zion National Park to Grand Canyon road trip guide • Discover the best route, scenic stops, travel tips, and must-see ...

Planning your next vacation to the extraordinary, iconic, stupendous Grand Canyon? Carved out by the Colorado River over ...

Plan a winter trip to the Grand Canyon with our winter guide to the Grand Canyon. Don't let a little snow keep you from ...

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