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, the Great Spas of Europe, it is nominated as a UNESCO World Heritage Site. At the same time the city is host to Germany's largest flower parade.
The city of Nassau with its summit castle, the cradle of the Dutch and Luxembourg royal family, offers with its half-timbered town hall, the Adelsheimer Hof, one of the most beautiful and romantic German half-timbered houses.