Postojna Cave stretches over 24,120 meters and offers a spectacular underground world full of stalactites and stalagmites. Visitors can take a guided tour through the huge stalactite halls and use the cave train that leads deep into the cave system. A highlight for many is a visit to the famous "Brilliant", an unusual white stalactite formation. The cave is also home to unique wildlife, including the cave olm, a rare amphibian species. The cave is a place that not only delights nature lovers, but also families and adventure seekers. Image: Walter Frehner - unsplash.com