Movies filmed in Postojna cave, Yugoslavia

There are 6 movies that were filmed in Postojna cave, Yugoslavia.
City: Postojna Country: Slovenia
Winnetou - 2. Teil
(1964)
Ring of Spies
(1964)
Die Nibelungen, Teil 1 - Siegfried
(1966)
Le gladiatrici
(1963)
Taur, il re della forza bruta
(1963)
Jedini izlaz
(1958)