LUDWIGSHAFEN, GERMANY. Ludwigshafen is your gateway to a choice of four excursions. Visit Heidelberg, the perfectly preserved medieval city nestled in the Neckar River Valley along Germany’s Castle Road. Discover the iconic red sandstone Heidelberg Castle and Great Vat, an 18th-century, 49,000-gallon wine cask. Here you can also enjoy visiting some of the festive Christmas Markets. For a more active adventure while in Heidelberg, join a guided hike up the Philosopher’s Path, aptly named during the Romantic Period, and enjoy panoramic views of the city. Alternatively, you can visit one of Germany’s oldest cities, Speyer, known for the largest Romanesque cathedral in Europe—a UNESCO World Heritage Site—and the medieval Old Gate, Altpörtel. In your free time, you might choose to visit the Christmas Markets or Technik Museum featuring exhibits of vintage cars, military aircraft and even a submarine! (B,L,D)