Velebit caves
The "Lukina jama" cave is 1431 m deep (2013), the deepest cave in Croatia, 14th deepest cave in the world and the deepest cave in southeast Europe. At its foot, there are ponds and streams including one of the largest known colonies of subterranean leeches ("Erpobdella mestrovi"), which has been ascertained to represent a new species, genus and also family. Other species discovered in the system, include the air-breathing land snails "Zospeum tholussum". Like Lukina jama, Slovacka jama, Velebita and Meduza are also located at the "Hajdučki i Rožanski kukovi" special reserve, a dedicated part of the Sjeverni Velebit national park.
Baumann's Cave
The cave is frequently mentioned in the early scientific and travel literature as it has been open to the public with guided tours since 1649 when Valentin Wagner was installed as first cave guide. Baumann's Cave is probably the oldest regularly frequented and guided show cave, at least in Germany. Amongst its most famous visitors was Johann Wolfgang von Goethe. The cave's biggest chamber, the "Goethesaal", is named after him and is fitted with seats and a stage for concerts and plays.