Rick looks back fifty years to when the Berlin Wall was built, and discusses with a Berliner what it meant to split the city in half. Also, two participants from a madcap road race from London to Mongolia explain what it's like to finish the Mongol Rally in one piece. Also, a biologist explains how travelers can examine the natural world through the eyes of a Darwinian Tourist.For more information on Travel with Rick Steves - including episode descriptions, program archives and related details - visit www.ricksteves.com.