Inside the Hermit Kingdom: Eyewitness views from North Korea

It's the most isolated nation in the modern world, a closed society that the information age has barely penetrated, a place where teenagers have never heard of Beyonce and Facebook is just a mysterious word. North Korea is also a parallel universe, in which the United States is an evil empire bent on destruction, and patriotic North Koreans take it for granted that they would crush America in a nuclear war. Western options for defusing the situation have always been limited. As Donald Trump and Kim Jong Un escalate their war of words, guest host Todd Purdum speaks with journalists who've had rare firsthand access to Pyongyang. How worried should we really be?