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Easily one of the most famous attractions in all of Iceland, the baby blue waters of the Blue Lagoon hover between 98 and 104 degrees. People from near and far flock there for the water’s purported therapeutic benefits on the skin. The combination of silica, algae and minerals help exfoliate and reduce inflammation so well that there’s actually a line of skin care products made from the water. Open year-round, the site tends to get busy, so the staff recommends visiting in the late afternoon if possible.