6 Things You Might Not Know About the Blue Lagoon, Iceland's Not-So-Natural Wonder

You might not want to dunk your head in the water. The lagoon originally formed as a reservoir of runoff water from a geothermal power plant in 1974. People noticed the milky water's skin-healing properties and more and more used the area to bathe. In 1999, it was moved to a nearby lava field, where it stands today.

Though the waters are fantastic for treating psoriasis, they may cause damage to your hair. If you have colored hair, it could very well be stripped. The lagoon's site suggests keeping your hair up in a shower cap and leaving in the complimentary conditioner provided at the showers.