The cave originated as a coral reef in the ancient tropical sea of the Devonian period.
It is one of the longest natural caves in Germany, with a total length of approximately 5,800 meters.
The cave walls contain clear evidence of stromatoporoids and rugose corals.
In the early 20th century, the site was used for secret meetings and as a refuge during war periods.
The cave system was rediscovered in its current form through mining and excavation efforts.
The interior climate is used therapeutically in speleotherapy due to the high purity and humidity of the air.
It serves as a significant winter habitat for several species of protected European bats.
Kluterthöhle is a national geotope located in the Ennepe-Ruhr district, representing one of the most important fossil-rich coral reef caves in Germany. The cave system is a remnant of a Devonian-era reef that existed approximately 380 million years ago, featuring distinctive coral fossils embedded directly into the limestone walls. Visitors explore a labyrinthine network of passages that spans several kilometers, with the guided section totaling about 360 meters. The constant interior temperature of approximately 10 degrees Celsius requires specialized clothing regardless of outside weather conditions. As a protected natural monument, the cave also serves as an important habitat for various bat species during their hibernation period. The site is managed by the city of Ennepetal and includes a visitor center that documents the geological history of the region. Tours are strictly guided due to the complex nature of the tunnel network. It is designated as a protected geoscience site due to its unique sedimentary structures.
The main cavern entrance and the specific rock formations clearly showing fossilized coral clusters.
Wear sturdy, non-slip footwear as the ground can be uneven and damp.
Bring a warm jacket, as the cave maintains a constant low temperature year-round.
Check the official website to book guided tour slots in advance, as group sizes are limited.
Attempting to enter the cave system outside of scheduled guided tours, as the labyrinthine passages pose a significant safety risk.
The cave is closed for public tours during the winter months to protect the hibernating bat populations.
Do not touch the cave walls or fossil structures, as oils from human skin damage the mineral surface. Remain with the guide at all times.
