I visited all the major US national parks and ranked them based on factors like beauty and crowd size. My favorites include ...

I've been to all 63 US national parks and ranked them from my least favorite to my top pick. I think parks like Congaree, Petrified Forest, and Channel Islands are best suited for a day trip.

Moonrise and Earth’s shadow looking east from the crater’s rim. The red-and-black volcanic cinder cone, located in Arizona’s Painted Desert, last erupted around 900 years ago. Michelle ...

James Turrell discusses his ongoing land art piece, Roden Crater, created within a pit formed by an extinct volcano in the Arizona desert. ART21: Where are we, right now? TURRELL: Well, right now ...