Naracoorte Caves National Park is the reason Naracoorte passes the one-day test. The caves form part of the Australian Fossil Mammal Sites World Heritage listing, preserving an exceptional record of extinct Australian animals over hundreds of thousands of years.
The standard cave tours are approachable, while the fossil-focused tours go deeper into the science and working dig areas. Even if you usually skip caves, this one is about evolution and lost animals as much as stalactites.