Petnica Cave
The 81st longest cave in the world
0.6km · Length
Petnica Cave is located in the village of Petnica, near the city of Valjevo, Serbia. The cave has been popular for tourism since at least the 19th century, when it was one of the three most popular caving destinations in Serbia along with Prekonoska and Lazareva Pecina.
Cave data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).