An analysis of data from 1999 through 2023 shows 93% of parks and wilderness areas saw improved air quality on clear days.

The Tamaulipan thorn forest once covered 1 million acres on both sides of the US-Mexico border. Restoring even a fraction of it could help the region cope with the ravages of a warming world.

While many of Alaska's best destinations are tightly guarded secrets, the largest vehicle-accessible glacier in North America is a favorite that locals don't mind showing off.

Alaska, with its awe-inspiring landscapes, diverse wildlife, and captivating culture, offers a truly unique family vacation ...

Whether you want to hike through mountains ablaze with wildflowers, ski in the Southern Hemisphere, visit one of the world's best restaurants or find solitude amid Arctic wilderness, here are some of ...