The longest publicly accessible cave in the Rhineland is hidden away in Ründeroth. It is a massive 1,071 metres long - 270 metres of which can be walked through. The Aggertal Cave is also a venue for concerts and cultural performances. A guided tour lasts 50 minutes - and on Sundays concludes with an impressive musical finale. In autumn, however, these caves are closed. This is when the bats arrive to spend the winter underground. 

Just a few metres further on is the Windloch, which was discovered in 2019 and is now the largest cave in North Rhine-Westphalia. It is still being explored and will not be opened to the public in the foreseeable future - the geological treasures that have been discovered there are too valuable. The latest information about them is posted at www.akkh.de. 

The Wiehl Stalactite Cave (Wiehler Tropfsteinhöhle) is open all year round. The cave contains fascinating rock formations that capture the visitor's imagination. A romantic setting that is also popular with newlyweds, the stalactite cave is the official wedding venue of the town of Wiehl. 

There are several other small caves in the Bergisches Land, but they are not suitable for exploring.