RHINELAND

The Rhineland (German: Rheinland) has become the name for several areas of Western Germany along the Middle and Lowe Rhine between Bingen and the Dutch border (wikipedia)
Sankt Goar
Sankt Goar (St Goar)is a town on the west bank of the Middle Rhine and well known for its central location in the Rhine Gorge, a UNESCO World Heritage Site.
The Rhine Gorge is a popular name for the Upper Middle Rhine Valley, a 65 km section of the River Rhine between Koblenz and Bingen in Germany
It was added to the UNESCO list of World Heritage Sites in June 2002 for a unique combination of geological, historical, cultural and industrial reasons.
Sankt Goarshausen

Sankt Goarshausen is the sister town of St Goar and located directly across the river from St Goar
NEUWIED
Neuwied is a town in the north of the German state of Rhineland-Palatinate, capital of the District of Neuwied
HAMBURG
Hamburg is the second largest city in Germany.On the river Elbe, the port of Hamburg is the second largest port in Europe and tenth largest worldwide.

a short stop- one hour stop in Hamburg on a bus trip from Amsterdam to Copenhagen