Wiehler Tropfsteinhöhle, Show cave in Wiehl, Germany

Wiehler Tropfsteinhöhle is a show cave about one kilometre south of Wiehl on the road to Nümbrecht, with a passage system 868 metres long. It lies in an isolated limestone outcrop surrounded by sandstone and clay slate, a fossilised coral reef from the Devonian sea, so corals and shells can be seen in the rock. Electric lighting is installed and guided tours are offered.

The cave was discovered in 1860 during blasting in a limestone quarry. Its development for visitors took place in 1926/27 as public emergency works to create jobs during high unemployment, when large amounts of cave clay had to be removed. Since 1997 the Arbeitskreis Kluterthöhle has provided scientific supervision and carried out a new survey between 24 January and 28 March 1998.

The cave's name refers to its dripstone formations, and the city of Wiehl holds wedding ceremonies inside it. Because of the high humidity, mosses, ferns and lichens grow in the cave, so visitors see green plants alongside the limestone. Guided tours are offered, and the passages are lit by electric light.

The path through the cave is challenging to walk because of narrow passages and uneven ground, so sturdy footwear is important. The temperature stays cool year-round, so a jacket is recommended no matter what the weather is like outside.

The cave lies in an isolated limestone pocket surrounded by sandstone and clay slate, a fossilised coral reef from the Devonian sea. Visitors can spot fossils of corals and shells in the rock around the passages.