Glacial caves of Kverkfjöll

Recommended
This geothermal area is hard to reach, but spectacular. A warm-water river runs beneath the glacier tongue in a 30km-long tunnel. Embark on a one-day hike to marvel at the enormous blue-tinged ice blocks, the fumaroles and the bubbling mud pots that come together in an unreal landscape. Alternatively, there is a shorter itinerary but, whichever you choose, get a guide to accompany you.

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