A bestselling author of a book on the Northwest Passage describes how the Inuit of Canada and Greenland are responding to modern challenges posed by changes to the Arctic environment. Then we delve with a filmmaker into the pre-Columbian world of the Incas, and ponder what untold stories the Andes Mountains may still hold. Plus, a well-traveled journalist joins us to consider the impact of recent growth in the global travel industry, wherein a billion people a year now cross international borders in search of something new.