Postojna Cave is a 24,120 m long karst cave system in Slovenia. It is one of the top attractions in Slovenia. In 1872, cave rails were laid along with first cave train for tourists. At first, these were pushed along by the guides themselves, later at the beginning of the 20th century, a gas locomotive was introduced. After 1945, the gas locomotive was replaced by an electric one. About 5.3 kilometers (3.3 mi) of the cave system are open to the public. After your tour of Postojna Cave, your driver will take you safely to Zagreb!