Explore romantic Heidelberg and the Upper Middle Rhine Valley on a delightful combination of a city tour and river cruise. Admire some of Germany's most charming sights, from the medieval castles in one of the country's most beautiful cities to a ride on a classic steamer. Your day starts with a ride south from Frankfurt to the picturesque city on the river Neckar. Tour the famous Heidelberg Castle for a look at the long courtyard, the mighty terrace, and one of the largest wine barrels in the world, and then take a walk in the city's medieval town center to marvel at the Old Bridge, Karl's Gate, the Church of the Holy Spirit, and the House of the Knights, as well as the oldest university in Germany. Next, the tour takes you into the Upper Middle Rhine Valley, a UNESCO World Heritage Site thanks to its remarkable scenery and medieval structures. Admire the mighty castles, villages, and charming little vineyards, and then board a Rhine steamer for a voyage downriver from Kaub to the town of Assmannshausen. Once you're back ashore, stop to sample the local wine in a local tavern and enjoy a delicious dinner in a restaurant by the riverbank before the time comes for your return to Frankfurt.