Extreme places reveal the planet at its most dramatic, from open lava and giant underground spaces to freezing and toxic environments.

Two popular recreation areas near Cedar City will temporarily close on separate Saturdays in October to accommodate mountain ...

Arizona's tallest mountain is a nearly 13,000-foot high dormant volcano that's a hiking paradise in summer and a snow sports ...

The River Runs Through It Act, introduced by Montana Rep. Ryan Zinke, would protect just a fraction of public National Forest ...

At a volcanic observatory in Kyushu, Saki Manabe, who is in charge of calibrating ash collectors, was woken up by a radio ...

This video shows Meteor Crater in Arizona, United States, as a huge circular depression surrounded by an elevated rim in an otherwise broad and relatively flat desert landscape. The aerial view ...

Restaurants and food carts are inspected at least twice a year by Jackson County Health Department employees. Inspectors look ...

The mountain town of Aspen isn’t just a gnarly spot of X Games sports, or a seventh home location for the world’s most ...

NASA’s Curiosity rover marked 5,000 Martian days by sending back a striking panorama that blends morning and afternoon views ...

NASA’s Curiosity rover marked 5,000 Martian days by capturing morning and afternoon views that were blended into a striking ...

Kimball State Recreation Site, sitting just north of Fort Klamath near Chiloquin, Oregon, is exactly that kind of place.

This video shows Punchbowl Crater from above, surrounded by green lawns, trees, nearby neighborhoods, and the wider Honolulu ...