of Steinheim by the Lords of Eppstein to the Electorate of Mainz. After the Archbishopric of Mainz was secularized, Mühlheim became Hessian. In 1819, after the Biebermark was partitioned, Mühlheim got what is today called the Markwald (forest). In 1873, the Frankfurt-Hanau railway by way of Mühlheim was brought into service. Ever since 1939, when in the framework of National Socialist administrative reform the rural community of Mühlheim and the village of Dietesheim were forcibly merged to become the town of Mühlheim am Main, Mühlheim has had town rights. In 1977, in the framework of municipal reform, Lämmerspiel was amalgamated with the town. Politics Town council The municipal election held on 27 March 2011 yielded the following results: Coat of arms The town's arms might be described thus: Azure a six-spoked waterwheel argent with twelve buckets, in chief three Immertreu of the second with centres Or. Culture and sightseeing Theatre The travesti theatre Gerda’s kleine Weltbühne (Gerda's Little World Stage”) has for more than 30 years been a constant in Mühlheim's cultural life, and been known far beyond Mühlheim and very popular. Its shows are often fully booked months ahead of time. In the “SCHANZ” cultural hall, the converted former apprentice's workshop of the firm Stahl-Schanz, the Kulturfabrik EigenArt e.V. (a club) has been staging theatrical, cabaret and musical events weekly since 1998. Museums Mühlheim has its own town museum. Moreover, there are also private collections, among them Mühlheim entrepreneur Hans-Günter Zach's Rolls-Royce Museum, visits to which are on request, upon payment of a donation for social purposes. Buildings Mühlheim's watertower, an historic basalt structure near the Mühlheim railway station, is a widely visible landmark of the town, and is still in use. Natural monuments The conservation area Dietesheimer Steinbrüche (“Dietesheim Quarries”) represents a natural backdrop that is unique in the Frankfurt Rhine Main Region. It is the former basalt quarries in the outlying centre of Dietesheim, which, after basalt mining was given up, was renaturalized and opened to the public. Particularly impressive are the basalt cliffs at the Vogelsberger See (lake). Sport Besides various sport fields for ball sports, there are both an indoor and an outdoor swimming pool in the outlying centre of Lämmerspiel. On the Main, there are rowing sports. Furthermore, it is possible to engage in shooting sports at the Schützengemeinschaft Mühlheim-Dietesheim under Deutscher Schützenbund rules, as well as, in some departments, under Bund Deutscher Sportschützen