Hohenstein-Ernstthal is a town in the Zwickau rural district, Free State of Saxony, Germany. The towns of Hohenstein and Ernstthal were united in 1898, and the town is either known by its hyphenated form, or simply called Hohenstein. The town grew in the 15th century after silver mines were established nearby. Ernstthal was named in honor of August Ernst von Schoenburg. Physicist Gotthilf Heinrich von Schubert and inventor Christoph Gottlieb Schröter were born in Hohenstein. The writer Karl May was born in Ernstthal. The house of his birth is a museum. Furthermore, Hohenstein-Ernstthal is especially famous for the Sachsenring racing circuit. As of 2013 Lars Kluge is the mayor of Hohenstein-Ernstthal.