Since ancient times, the Rhine has been one of the world's busiest rivers and major trading routes. Robber-baron castles placed strategically along the Rhine collected taxes that helped towns get rich. Today, under the watchful eye of once-mighty castles, barges carrying thousand-ton loads and busy trains transport goods and tourists along the river. For more information on the Rick Steves' Europe TV series — including episode descriptions, scripts, participating stations, travel information on destinations and more — visit www.ricksteves.com.