Our first stop of the day in Slovenia was Postajna Cave. Apparently, it is the most visited tourist cave in Europe! To enter the chambers, you need to take a short ride in (3.7km) on the cave railway, which has been in existence for 140 years.
From there, it was about 1.5 hours of walking (5km) while observing the stalactites and stalagmites. Throughout the entire duration, you will be accompanied by a guide who would call out numbers at certain points for you to press on the audio guide.