Foto: Guido Wagner

In search of the Aggertal and Windloch caves

The fascinating world of the new Windloch cave system

2019 witnessed the discovery of a century for more than just the Bergisches Land: in Mühlenberg near Ründeroth, over the last 20 years researchers had searched high and low for an entrance to what they suspected was a cave, but once they found a way in to the Windloch they discovered an incredible underground realm of extraordinary crystals, limestone features and impressive caves of unimagined dimensions in which no humans had ever set foot before. Measurements taken in the first few months indicated that, at more than 8,000 metres long, the Windloch is the largest cave in North Rhine-Westphalia and one of the 10 largest anywhere in Germany.

Ten information boards spread out along this roughly 8.4 kilometre route offer lots of detail about the work of the speleologists. You can also see sinkholes and karst springs, and can finally visit the Aggertal Caves as part of a guided tour.

You can listen to the scientists report enthusiastically about their discoveries at two audio stations.


theme: caves
length: 8,4 km
duration: approx. 2,5-3 hours
stations: 10

train station Ründeroth, 51766 Engelskirchen


Gastgeber Bergisches Wanderland

On the Höhlenweg (Cave Trail), there are various refreshment and accommodation options. The following establishments cater specifically to the requirements of hikers and have been granted the "Gastgeber Bergisches Wanderland” (Bergisch Hiking Country Host) certification:

Gasthof Zum Stausee

Hardter Hof

Haus Kranenberg


guided hikes

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Video "Kristallwunder Windloch"


height profile

map of the route

flyer for download (in german)