Charlotte Cave - Credit: Wikimedia Commons
Charlotte Cave is a dripstone cave near Hürben, a district of Giengen, in the Swabian Jura in Baden-Württemberg. The cave is 587 meters long with side passages, lies 487.5 meters above sea level and is probably two and a half to three million years old. The Hundsloch, the entrance to the cave, was already recorded in a forest map in 1591. The population threw cadavers of domestic animals into this hole. The first excavation was made by head forester Hermann Emil Sihler in the spring of 1893 with a rope ladder. During further explorations and excavations, the cave was uncovered, opened to the public and equipped with electric lighting. The ceremonial opening took place on 17 September 1893. On 23 September Queen Charlotte of Schaumburg-Lippe visited the show cave named after her. This is used for tourism as a show cave over a length of 532 meters and is one of the information points of the UNESCO Swabian Jura Geopark, about 100 kilometers east of Stuttgart. Read more on Wikipedia
Source: en.wikipedia.org