Iceland's Vatnajökull Glacier is one of the most beautiful — and geologically important — places in the country. Glaciers are some of Earth's most ethereal — and mighty — natural phenomenons.

Katla, hidden beneath the Mýrdalsjökull glacier, is another looming threat, with a history of catastrophic eruptions. Iceland ...

"Crampons make it easy to climb the ice without slipping," says a guide to scaling Vatnajökull, Iceland's largest and most ...