Join us on an unforgettable 5-hour adventure to explore the breathtaking Postojna Cave, featuring a thrilling underground train ride through an expansive network of passages stretching over 20 kilometers (12 miles) in length. As the largest known cave system in the country and second-largest accessible to visitors globally, Postojna Caves is a true natural wonder, nestled beneath the karstic limestone plateau on the eastern edge of the Postojna basin. This incredible ecosystem is home to an array of local wildlife that call the cave their home. After uncovering the secrets of Postojna Caves, we'll take a short 10-minute journey to the magnificent Predjama Castle, perched precariously on a towering rock face above the Lokva stream. This medieval marvel is renowned as the world's largest cave castle, offering a truly one-of-a-kind visual experience that will leave you awestruck - and provide a fantastic photo opportunity!