Blood Falls, Antarctica
This blood-red waterfall in the Taylor Glacier in Antarctica stands 5-stories tall. What scientists once believed were algae responsible for the deep-red color of the falls turns out to be a hidden lake buried underneath the glacier. This lake has been trapped under a thick layer of ice for two million years, in which time it has developed microbes that exist with little oxygen and heat. A small crack in the glacier is the only reason we’re able to see this lake, rich in iron, flow into the waterfall.