Just 30 minutes from downtown Flagstaff, Sunset Crater Volcano National Monument offers a striking look at northern Arizona’s explosive past.

Sunset Crater Volcano National Monument Just north of Flagstaff, an extinct volcano cone and a lava-trail hike are beautiful yet eerie reminders of the brutal forces of nature.

Sunset Crater, a cinder cone volcano located north of Flagstaff, Arizona, is an iconic geological feature in the Southwest.

A collapsed lava tube at Sunset Crater National Monument is partially buried in snow in this January 31st photograph.

Central Oregon isn’t just a destination—it’s an entire adventure zone packed with lava tubes, high desert canyons, volcanic ...

As you meander through the Bonito Lava Flow, an otherworldly landscape of cinders and twisted lava known as 'aa' (pronounced ah-ah), you'll notice a few collapsed lava tubes amid the jagged blocks ...

Working alongside several collaborators, they have painstakingly mapped every fissure, eruption deposit, and ancient lava flow of Sunset Crater to reconstruct the complete splatter patterns and ...

The SETI Institute and the Mars Institute announced today the discovery of small pits in a large crater near the North Pole of the Moon, which may be entrances to an underground network of lava tubes.

New images from NASA's Mars Reconnaissance Orbiter (MRO) suggest there is an underground network of lava tubes beneath the lunar surface that could offer astronauts easy access to water.

Sunset Crater Loop Road, along with the Lava Flow and A’a trails, are open once more, according to the National Park Service’s website.

New NASA images show small pits in a crater near the north pole of the moon. These pits are believed to be lava tube "skylights" — entrances to underground tunnels that were once filled with ...