In 1911, explorer and geographer Thomas Griffith Taylor stumbled upon a bizarre sight at the edge Taylor Glacier in East Antarctica. Taylor noted the occurrence of red blood-colored water flowing out of the glacier. At first, scientists thought it was some sort of algae that gave the water the reddish color. They eventually realized iron oxides were the reason, but how this occurred remained a mystery for over 100 years. In 2017, scientists finally discovered the source. Using radio-echo sounding radar, they were able to uncover that the waterfall was connected to an iron-rich source of water trapped under the glacier. The briny water source is believed to be over a million years old -- making Blood Falls one very strange and very old waterfall.