Let"s be frank here, the origin of today"s beautiful picture is a pool of wastewater from a nearby geothermal plant. While that may not sound enticing, Iceland"s Blue Lagoon is one of the country"s most-visited attractions. The trick is to not get stuck on the "waste" part of wastewater. The water here is clean, always hovers around 100° F, and is enriched with tons of silica—which is what makes it blue—and sulfur, thanks to the plant"s processes. Those minerals, along with a little algae, are believed to combine into a highly beneficial tonic for skin and overall well-being.