Cycling where the trains of the industrial age once rattled: On 113 kilometers with little incline, the Ruhr-Sieg Cycle Path leads through a hilly region full of natural experiences and follows former railroad tracks over long stretches. One of the many highlights: the view over the mighty Biggesee, a popular vacation paradise and, as one of Germany's largest dams, still important today for the water supply of the Ruhr region. Another worthwhile stop is the excellently preserved Wendener Hütte, whose charcoal technology is a precursor of the later coke blast furnaces on the Ruhr. Real railroad feeling comes when you go underground: in the Fledermaustunnel between Eslohe and Finnentrop and in the Hohenhainer Tunnel near Freudenberg.