The Rennsteig, an ancient path following its summits along the main ridge, now a famous hiking path, marks the traditional boundary between northern and central Germany, the boundary between Thuringia and Franconia. Dialect,and traditional customs and costumes were different on either side of the Rennsteig.
The Thuringian Forest is famous for Wartburg Castle where (Martin Luther stayed for some time in exile) and winter sports resorts.