Iceland’s Caldera of Hot Springs

If you ever have an urge to hike—or even bathe—inside a volcano, you may want to visit Torfajökull. While this volcano has not had a large eruption since 1477, its 18-kilometer by 12-kilometer caldera is home to one of Iceland’s largest geothermal areas—an exotic landscape dotted with steaming sulfur and mud pools, hot springs, and gas vents.

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