How Bob Krist spent decades traveling the world

Since 1976, Bob Krist has been traveling the world and documenting faraway cultures and places for magazines like National Geographic and the Smithsonian. Bob, who lives in San Miguel de Allende with his wife, doesn't plan on retiring. In fact, he's now experimenting with a new medium -- video documentaries! His goal, as he puts it, is to keep "looking for interesting stuff to stand in front of." Learn more about Bob and his travels in this episode of "Lifers."