Eisenach is a town in Thuringia, Germany with 42,000 inhabitants, 50 kilometres west of Erfurt, 70 km southeast of Kassel and 150 km northeast of Frankfurt. It is the main urban centre of western Thuringia, and bordering northeastern Hessian regions, is near the former Inner German border. A major attraction is Wartburg castle, which has been a UNESCO World Heritage Site since 1999.