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 ...

Hawaii is home to some of the most incredible lava tubes that are open to exploration. These include Thurston Lava Tube in ...

Some were millions of years old. Others formed tens of thousands of years ago. Recently, he explored caves that are even younger: pristine cavities known as lava tubes, forged inside cooling ...

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 ...

Discovered in 1878, Luray Caverns has been drawing visitors for over a century—and it's easy to see why. Located just west of ...

Oregon is home to some of the best examples of deep caves and ancient lava beds formed ages ago from the many volcanoes in ...

The Canary Islands not only boast the third largest volcano in the world, but also the largest natural underwater lava ... caves that are open to visitors and natural caves that were formed ...

Arizona has numerous famous caves — some readily open to ... fs.usda.gov. This milelong lava tube north of Flagstaff formed about 700,000 years ago. During a volcanic eruption, flowing lava ...

It includes Geomunoreum, regarded as the finest lava tube system of caves anywhere, with its multicoloured carbonate ... with its waterfalls, multi-shaped rock formations, and lake-filled crater. The ...

About 5 miles from downtown Hilo, on Kaumana Drive, you'll find the Kaumana Caves. Originally formed in 1881 by lava flow from Mauna Loa, the caves are now accessible to visitors via a metal ladder.