Geology is full of detective stories about the 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.

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

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.

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.

Flagstaff Weather Forecasts. Weather Underground provides local & long-range weather forecasts, weatherreports, maps & tropical weather conditions for the Flagstaff area.