Among the oldest open caves in the world, dated to over 340 million years, in the Blue Mountains west of Sydney. Eleven show caves of flowstone, underground rivers and a natural limestone arch you drive through to reach them. Discovered to Europeans in the 1830s while chasing a bushranger who hid in them. PUBLIC guided tours.
Australia
See it on the map
This is remote ground. The closest other places on the map are a long way off.
