Centuries of eruptions on the Big Island have created hidden networks of passages beneath volcanoes. In December 2016 a large lava delta formed by Kilauea volcano sank into the sea, exposing the ...

Approximately 700,000 years ago when molten rock erupted from a vent in nearby Hart Prairie, the mile-long Lava River Cave was formed. Today, visitors can explore the cave's cool, dark expanse by ...

The Moon's surface is pockmarked with more than 200 known pits where rocks and regolith collapsed into depths unknown. New ...

Lava tube caves take you deep into ancient volcanoes, where molten rock once carved tunnels in the earth. These underground ...

With its iconic mountains, rivers, and coastline, it’s easy to overlook the adventure of discovering some of Oregon’s ...

The Hallmundarhraun lava field—basalt dark, with great swells and a froth of white moss—looks like a stormy sea whipped into a frenzy and frozen in place. It begins under the Langjökull ...