The lure of discovery and adventure has long attracted hardy souls to the North hand South Poles. For more than a century, using dogsleds, animal skins, and wooden ships, explorers tried to reach the top and bottom of the Earth. Their sometimes-deadly treks become international legends. With today's modern methods, exploration of these vast regions continues. Inside, meet the brave people who first heard the call of the ice, as well as the modern experts who strive to add to these early discoveries.