cave · Postojna
Postojna Cave
A 24 km cave system open to visitors since 1819, toured partly by underground electric railway.
- 1 h 40 min
- 1.5 km
- Highly rated
Postojna
The town above Slovenia’s most visited cave system, halfway between Ljubljana and the coast.
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Original uploader was Boštjan Burger ( Lander ) at sl.wikipedia 
Tiia Monto - museum