Out of Eden Walk: Walking the DMZ

North Korean leader Kim Jong-un's destruction of roads and rail links to South Korea this week illustrated the ongoing tensions on the Korean Peninsula. But as National Geographic Explorer Paul Salopek discovered while walking there, the demilitarized zone (DMZ) that has divided North from South for 71 years can be a quiet, peaceful stretch of land - and water. He shares his observations with Host Carolyn Beeler.