400 Million B.C.T. - Gondwana Became the South Pole

Around 400 million years ago, Gondwana, the supercontinent, became the South Pole. 

While Gondwana was the South Pole, the land that today is Africa was covered with glaciers, its ice cap was as thick as Antarctica's is today.  Indeed, the region that is today known as the Sahara -- a region that is today one of the hottest places on Earth -- bears traces of the time when the desert was an iceland.