Kubacher Kristallhöhle, Weilburg

Kubacher Kristallhöhle in Kubach near Weilburg, in the eastern Hintertaunus in Hesse, is a fissure cave in Upper Devonian limestone. Large parts of the walls are studded with countless calcite crystals and pearl sinter. The crystal jewelry of the walls is considered unique in this form in Germany. With a length of about 170, a width of up to 26 meters and a height of up to 30 meters, the cave is considered the largest natural underground single cavity that can be visited in Germany. Its formation cannot yet be fully explained with today's theories of cave formation.

The Kubach Crystal Cave was discovered in an unusual way: In 1974, the Kubach Cave Association carried out search drillings with the help of a camera in order to find a dripstone cave again, which had been approached in 1881 during phosphorite mining, but whose exact location was no longer known. In the spring and fall of 1974, two previously unknown caves were discovered, including the Crystal Cave. In the following years, this cave was developed, expanded and opened on March 1, 1981. Since then it has been used for tourism as a show cave with regular guided tours. The annual number of visitors is about 34,400.

The Kubach Crystal Cave is a geo-information center of the Westerwald-Lahn-Taunus National Geopark.