When most travelers think about river cruising, they picture Europe: the Rhine, Danube, medieval towns, castles, vineyards and Christmas markets. And for good reason. European river cruising is wonderful. But there are some fascinating river cruises outside Europe, including journeys on the Nile, Mekong, Chobe, Magdalena and Amazon. Some of these are particularly intriguing to me because the river isn't simply a beautiful route between cities. It's part of the story of the de