160 Helen Thayer: Walking the Gobi Desert

Helen Thayer, one of the most remarkable adventure travelers of our time, dreamed of trekking across Mongolia since she was a schoolgirl. At the age of 63, she and her husband became the first people to walk the entire length of the Gobi desert -- the long way. Find out what they learned about the desert, the local nomads they met, and the deadly dangers they faced while on foot in the Gobi for three months.