Interesting fact
Postojnska jama, located in Slovenia, is a 24,120-meter-long karst cave system renowned for its extensive stalactite and stalagmite formations. Created over millions of years by the Pivka River, it is the largest cave system in the country and has been open to visitors since the early 19th century.
More about Postojnska jama
The Postojnska jama cave system features an electric train that transports visitors through a network of tunnels and chambers, including the notable Concert Hall, which has excellent acoustics. Discovered in 1818, the cave has been a tourist attraction since 1819. It offers guided tours, which last approximately 1.5 hours, and features temperature averages around 10°C, making warm clothing advisable.