The lagoon's water is rich in mineral content, and its milky blue color is due to its naturally occurring algae. Almost 20 years ago, people with psoriasis found that when bathing in the lagoon, their symptoms drastically improved. (Clinical studies back it up.) Today, psoriasis sufferers can visit the spa's adjacent skin care for treatment.
Fun Icelandic fact #4: Iceland sits on the Mid-Atlantic Ridge, which explains the island's wild volcanic activity. The Eurasian and American tectonic plates meet at the Reykjanes peninsula, home of the Blue Lagoon.