Heading south, to the Karst region of Slovenia, we will discover the immense underground treasure known as Postojna cave. A remarkable system of underground halls, tunnels and dripstone formations, it is one of the most popular attractions in the country. To make it more exciting, the visit of Postojna Cave starts on a small electric train ride that takes you into its depths. A guided walking tour inside the cave will uncover its mysteries, including the olm, an intriguing creature nicknamed “the baby dragon”.