(heights). Even the Dasbach churchtower supposedly stands on the foundation of a Roman watchtower. Within the limits of neighbouring Taunusstein is likewise found such a replica near Orlen, right beside the remains of the castrum Zugmantel. Near the outlying centre of Heftrich stood the castrum Alteburg, of which, however, nothing more is to be seen. On 15 July 2005, the Upper-Germanic-Rhaetian Limes (the Limes Germanicus) was raised to World Heritage Site by UNESCO. War cemetery During the Second World War there were two reserve hospitals in Idstein – one in the castle and one in the Kalmenhof. When, towards the end of the war, it was no longer possible to transfer people who had died in the hospital to their hometowns, they were buried in the Idstein cemetery. After the end of the war, the Volksbund Deutsche Kriegsgräberfürsorge built a central memorial in Idstein, where all war dead from the district of Untertaunus were to be reburied. There are a total of 250 graves on the Idstein war cemetery. Of those buried there, 234 people are known by name. 10 dead are civilians. There are also six graves with fallen soldiers and Russian prisoners of war from the First World War. Most of the dead at the Idstein war cemetery died after the fighting ended. There is evidence that prisoners from the Rhine meadow camps ("Rheinwiesenlager") came to the Idstein military hospitals. Regular events As a yearly event highlight, the Hessen-Jazz Festival or more recently Idstein JazzFestival has been drawing thousands of visitors for 20 years into the Old Town's laneways. On three days, during the first weekend in the Hesse summer holidays, up to 75 different jazz groups on a dozen stages play from Friday evening to Sunday live in an open-air concert. The Unionskirche is the location for choral concerts of the Idsteiner Kantorei conducted by Carsten Koch twice a year, such as Orff's Carmina Burana and Bach's Weihnachtsoratorium in 2009. For the annual European Heritage Days the "Nassauische Kammerphilharmonie" has performed a Sinfoniekonzert on the occasion of the Tag des offenen Denkmals, including a series of Beethoven's symphonies. The Rheingau Musik Festival staged concerts here with Elizabeth Parcells, Chanticleer and ensemble amarcord, among others. In the church St. Martin an annual choral concert is performed by the combined choirs Chor St. Martin and the chamber choir Martinis, conducted by Franz Fink, such as Bach's St Matthew Passion