Set against the rugged black rocks of a volcanic lava field, the mineral-rich waters of the Blue Lagoon draw more than 700,000 visitors a year, making it Iceland’s most popular tourist attraction. Which means you’ll be taking it all in among swathes of others, in an experience that feels highly commercialised and like you’re in a vast, bustling spa resort rather than in pristine nature.

Be prepared to fork out between $100 and $150 (£75 and £112) for your visit and wave goodbye to your personal space, which makes the experience less than relaxing. It’s also not an entirely natural lagoon either: in fact, it’s an engineered pool fed off the run-off from a nearby geothermal power plant.

For a more rustic, natural experience that’s also completely free, visit the Reykjadalur Hot Spring Thermal River, a 45-minute drive east of Reykjavik and set in a beautiful valley, where temperatures vary between 36-40°C (97-104°F).

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