Geology is full of detective stories about the Earth's history, and a new paper in Geology by University of New Mexico ...

Geology is full of detective stories about Earth's history, and a new paper in Geology by University of New Mexico ...

Tzion Maron became separated from his family at Lava River Caves northwest of Flagstaff on Wednesday, according to Coconino County Sheriff's Office.

The Old Caves Crater Trail is one of the best hikes in Arizona for exploring caves built by the region's earliest inhabitants ...

Inside the Deep Caves Carved by Lava Centuries of eruptions on the Big Island have created hidden networks of passages beneath volcanoes.

In this video, we take you on a journey through Iceland’s most otherworldly natural wonders, from vast lava fields and volcanic craters to dazzling ice caves hidden beneath glaciers.

Flagstaff apartment fire forces resident to jump from second-story window Two people were injured after an apartment fire broke out early Monday morning in Flagstaff.

Visitors explore Wind Cave National Park in South Dakota. With 130 miles of explored passages, it is among the world’s longest cave systems and a popular spot for spelunking enthusiasts.

Here are new things to do in Flagstaff this summer, plus some old favorites. For more information, the Visit Flagstaff visitor center is in the historic downtown train station at 1 E. Route 66.

Flagstaff Extreme is ranked #11 out of 18 things to do in Flagstaff. See pictures and our review of Flagstaff Extreme.

Flagstaff Mountain & Nature Center is ranked #12 out of 13 things to do in Boulder. See pictures and our review of Flagstaff Mountain & Nature Center.

Mitchell Caverns feels like stepping into a fantasy world with its bizarre formations. The two connected caverns, El Pakiva ...