Iceland's Blue Lagoon : Toxic Waste or Therapeutic Spa?

Arguably the most famous spa on the planet due to it's striking blue water and contrasting black lava rock, The Blue Lagoon has a secret; It's not entirely natural! Right next door and strategically excluded from promo photos, is a geothermal power plant. It harnesses hot water from near a magma pool and uses it to generate electricity. The water is then pumped back into nature which created blue pools rich in silica, which is where the color comes from. A worker discovered the healing properties and the rest is history. Forbidden history maybe?