Six cities, six treasures: Trier, Germany's oldest city, marked by the UNESCO World Heritage. Walk in Siegfried's footsteps in the Nibelung and Lutheran city of Worms. Maximum wine enjoyment in the Gutenberg city of Mainz. Experience the myth of the Upper Middle Rhine Valley UNESCO World Cultural Heritage at first hand during a visit to Koblenz. Or go on a voyage of discovery in Speyer, the burial place of the German Empire. Not to forget Idar-Oberstein, the cradle of worldwide gemstone manufacturing. All of them regularly provide the setting for spectacular, cultural events.