8th century by Saint Disibod, an Irish missionary. Saint Hildegard of Bingen, a famous Christian mystic, also lived here for a while. Gemstone town Idar-Oberstein - The town is famous for its historic gemstone mines and related trades. Some of them are open to visitors. The German Gemstone Museum boasts many gemstone exhibits. Bad Kreuznach - The baths which give the town its name contain the noble gas radon, with supposedly curative properties. The town's most famous site is the Alte Nahebrücke (Old Nahe Bridge), one of the few remaining bridges in the world with buildings on it. Saline valley - Between Bad Münster am Stein and Bad Kreuznach the scenic valley of the Nahe has some bathing sites with hydrothermal and saline springs. Graduation towers, formerly used for salt production, are regarded as having beneficial health effects. The so-called "Rotenfels" (red rock), a steep cliff nearby with a height of and a length of was formed by the Nahe. Bad Sobernheim - The open-air museum of Rhineland-Palatinate in Bad Sobernheim has an exhibition four traditional villages with refurbished historic houses from different regions of Rhineland-Palatinate. The region is accessible via federal highway B41 which is connected to the motorways A60/A61 in the East and A62 in the West. Moreover, there is a railway line along the Nahe with regular connections between Mainz and Saarbrücken and stations in all bigger towns. Some to the north the Frankfurt-Hahn Airport is in the Hunsrück, offering daily flights to London Stansted and further weekly and seasonal connections. See also List of rivers of Rhineland-Palatinate List of rivers of Saarland References Rivers of Rhineland-Palatinate Rivers of Saarland Naheland Rivers of Germany