A bright red waterfall isn't something you'd expect to see on the icy landscape of Antarctica, but that's exactly what's pouring out from the foot of Taylor Glacier. A team of scientists now claims to have solved the long-standing mystery behind the crimson waters of Antarctica's Blood Falls. The bizarre and apparently grisly sight was first discovered in 1911 by geologist Thomas Griffith Taylor, who attributed it to red algae. It was only half a century later that the crimson color was identified as being caused by iron salts. Most intriguingly, the water starts off clear but turns red soon after it emerges from the ice, as the iron oxidizes on exposure to the air for the first time in millennia.