If you’re returning from a trip to Iceland, people will usually ask you one thing: Did you visit the Blue Lagoon? This massive, milky-blue pool has become an icon and an absolute can’t-miss spot—one of the country’s most popular tourist attractions. In a typical year, more than a million people come here for a soak….

Reykjavik is a funny sort of town. Sitting at 64 degrees north, it’s just two ticks below the Arctic Circle. The architecture is heavy and hardy, a mix of volcanic stones and corrugated steel, perfect for huddling against the tempestuous winds and trying temperatures of a typical Icelandic winter. And on your first arrival, you…