Hiking Across an Icelandic Volcano
John takes a hike across Hengilssvæðið (Hengill), the nearest active volcano to Reykjavik, with boiling springs and other geothermal features along its 140 km network of hiking trails.
Exploring Lava Tubes in Iceland
John journeys to the Center of the Earth down a lava tube in Iceland with the author of Icelandic Caves, Björn Hróarsson, as his group’s guide.
Iceland's Hot Stuff
Iceland is hot. Our September 2014 exploration of the country let us come face-to-face with steaming hot geologic features that are otherworldly in nature.
The Indiana Cave Trail
Four show caves in Southern Indiana make up the Indiana Cave Trail, providing close encounters of the underground kind with unusual karst features
Mysteries of Soreq
Israel’s only show cave is one of the world’s most highly decorated caves with an abundance of unusual speleothems, protected by Stalactite Cave Nature Reserve.
The First Public Walk in Britain: Calton Hill
One of the seven volcanic hills within Edinburgh, Calton Hill is an ancient cinder cone atop which the first public footpath in Great Britain was established, in 1775.
Exploring Maquoketa Caves State Park
Your view of Iowa is turned upside down at Maquoketa Caves State Park, a family-friendly caving destination south of Dubuque that lets you climb right in and explore wild caves.
Glowing Stones at the Sterling Hill Mining Museum
At the Sterling Hill Mining Museum in Ogdensburg, New Jersey, history meets glowing rocks, as fluorescent minerals show off an array of brilliant colors inside a former mine.
Ramble on the new Hinson Trail
The newly opened Hinson Trail, a loop south of Marianna along the Chipola River Greenway, is truly scenic, rugged, unusual, and historic.
Seneca Rocks
A mecca for Mid-Atlantic mountain climbers, Seneca Rocks is a showcase of extraordinary geologic wonders both above and below the earth's surface.
