633 Granada; Mount Ararat; Colombia's Rio Magdalena

Guides from Spain highlight the historical treasures you can find in Granada today, including the impressive Islamic art of its Alhambra palace. Rick Antonson tells us how he climbed to the top of Mount Ararat in Turkey and about its significance to nearby Armenians. And anthropologist Wade Davis explains how the flow of the Rio Magdalena helps define today's nation of Colombia.