The imperial spa Bad Ems, historic summer residence of numerous European monarchs and artists, is widely known for its impressive baronial architecture.
As one of the most important 11 historic bathing resorts in Europe.
From Wiki-Voyage: Bad Ems is a small Kurort in North-East Rhineland-Palatinate whose main claim to fame and indeed paragraph in world history
is being the site of the "Ems Dispatch", a telegram that played an important part in the outbreak of the 1870 Franco-Prussian war
and thus the foundation of modern Germany, indirectly leading to World War I and subsequently World War II.