Melting snow in Antarctica due to global climate change may have revealed signs of ancient human settlement on the icy continent. Some researchers believe that the disappearing snow is finally exposing the mysterious truth about the South Pole, that ancient sailors may well have reached the continent hundreds if not thousands of years before 19th century sealers and explorers. Their ancient settlements may be revealed in satellite images from NASA, which appear to show strange markings beneath the snow, some of which look like ancient structures, including a mysterious pyramidal building. But how old are these enigmatic remains and who built them?