Arrive in Speyer, one of Germany’s oldest cities, known for its cathedral, numerous churches and the 13th-century Altpörtel (“Old Gate”). Choose either a city tour of Speyer or a half-day excursion to historic Heidelberg, where you will visit the red-walled castle with its Great Vat (a 49,000-gallon 18th-century wine cask) and see beautiful views of the Neckar Valley and city below.