most scenic train rides in the world

For postcard perfect views of centuries old castles overlooking a picturesque river, consider this 62 mile journey on Germanys Rhine Valley Line from Mainz to Koblenz. Castles appear every few miles including Pfalz Castle on an island in the river?and when you arrive at your destination in Koblenz, you can visit the fortress of Ehrenbreitstein for a panoramic valley view. Fun Fact With a Eurail Pass, you can switch on and off from the train to riverboats operated by the KD Rhine Line.