You have the choice to explore two of Germany's historically rich cities, along with their festive Christmas Markets. Visit Heidelberg, a city that will capture your heart with its mighty castle and historic university. While here, wander along one of Europe’s longest pedestrian shopping streets, the Hauptstrasse, soaking up the Yuletide celebrations at the town’s Christmas Markets. Alternatively, you can explore one of Germany’s oldest cities, Speyer, known for the largest Romanesque cathedral in Europe—a UNESCO World Heritage Site. You'll also have time to visit its Christmas Market in front of the “Old Mint” (Alten Münze) in the famous Maximilianstrasse, with a view of the romantic imperial cathedral (Kaiserdom). Later in the day, sail to Rüdesheim where you can visit Siegfried’s Mechanical Music Museum; or taste one of the town’s special delights, Rüdesheimer Coffee, ceremoniously made with brandy.