Across the river from the village of Kaub, the boat-shaped toll castle Pfalzgrafstein, built in 1326, perches on an island in the middle of the Rhine. A once-dangerous rapid here (since modified) forced boats to use the right-hand side of the river, where a chain forced ships to stop and pay a toll. Pick up an audioguide (€2) to learn more about its history. To get here, hop on a Fährboot next to Kaub's car ferry dock.
