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Potočka Zijalka — Adventure Cave in Savinjska, Slovenia (115m Long, 15m Deep, varies°C)

Potočka Zijalka is a high-altitude archaeological cave at 1700 metres on the slopes of Mount Olševa in the Kamnik-Savinja Alps. Excavations have uncovered Neanderthal tools and bone artifacts dating back 40,000 years, including a pierced cave bear bone considered one of the oldest musical instruments ever found. The cave offers panoramic views of the surrounding peaks and requires a mountain hike to access.