Jenolan Cave, Australia
Photo Credit: Steve Christo/Corbis via Getty Images
The Jenolan Caves are some of the largest and most famous caves in Australia. They are west of the Blue Mountains in the Jenolan Karst Conservation Reserve. In addition to their beauty, they are also considered to be some of the most ancient open caves ever discovered.
Inside of the caves, there are Silurian marine fossils and some calcite formations that are completely white. Altogether, there are more than 25 miles of multi-level passages with over 300 entrances. The caves are also on the list of protected areas within the World Heritage Site.
