A short drive takes us to Romantic Heidelberg, the oldest university city in Germany. Reach the extended castle area by funicular and enjoy a guided visit through the courtyard and cellar, where you will see the world's largest wine barrel, built in 1751, along with views over the valley and the Neckar River. Stroll along Germany's longest pedestrian street past the 1389 Church of the Holy Spirit, the 1598 Zum Ritter building, and the old University Square. Back in Frankfurt, enjoy a panoramic drive and a walk through the city center to see the Roemer, the newly rebuilt old quarter, and archaeological Roman remains.