Viaduct on the Rhenish Donkey railroad line

Beautiful bike path unfortunately on the Dortmunder area which is already being asphalted long ago ... the eternal theater around a few meters nature reserve.

The thick-banked Finefrau sandstone from the Lower Witten layers, which slopes to the northwest and serves as the foundation of the Johannisbergstrasse road bridge.
Directly below lies the thin Geitling 3 seam (also called Mentor). It also occurs in the Zeche Nachtigall visitor mine and in the Dünkelberg quarry in Muttental, 2017. (Tilo Cramm)

Source: rheinischer-esel-dortmund.de/rad--und-wanderweg.html

Very nice bike path. Well developed.