In a world where almost every corner of the planet seems to have been mapped, photographed and documented, what does it mean to be an explorer today? Polar explorer and adventurerErling Kagge and journalist and foreign correspondentJon Lee Andersonreflect on the meaning of exploration in the twenty-first century. From the farthest reaches of the Earth to the complexities of human societies, politics and the natural world, they consider what remains unknown, where the next frontiers lie, and whether the greatest journeys of discovery today might be inward rather than outward. What is left to explore in a world that appears to have seen it all?