Tour guides from Lisbon paint audio pictures of the vivid art that colors the streets of Portugal, then a journalist and former diplomat tells of how curiosity led him to meet with healers in the jungles of Nicaragua and Belize. And travel writer Richard Grant explains how a particularly bitter Yukon winter in Dawson City inspired Jack London to write one of his most famous tales of the North. Plus, Rick's in-house art expert gives us a close-up appreciation of Leonardo's Mona Lisa.