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You sit in a small , open train . It goes into a hill , and the daylight is gone . It is in Slovenia , in Europe . The cave 's website gives a number : 24 kilometres of tunnels and halls . Your train ride is 3.7 kilometres long . The air inside is 10 degrees all year , so bring a warm jacket . The train has a long story , too . The cave 's first railway opened in 1872 . Guides pulled small cars , with four visitors in each car . In 1956 , the cave started to use electric engines . The train stops , and you walk . Stone columns go from the floor to the roof . One white stone is five metres tall . Its name is the Brilliant . Water runs down it , drop by drop , and keeps it white . Near the end , you see a tank of water . An olm is a kind of salamander . It can not see , because its eyes are under its skin . It can live for 100 years . Long ago , olms came out of the cave after big rains . People believed they were baby dragons . Then the train takes you back out of the hill , into the daylight . 
