Naracoorte Caves Conservation Park

Limestone caves beneath South Australia's southeast hold one of the world's most significant Pleistocene megafauna fossil deposits — the accumulated bones of giant wombats, marsupial lions and giant kangaroos laid down across 500,000 years. The chambers are World Heritage-listed, cold and dark in the way geology tends to be. Worth the detour from the Coonawarra wine trail for reasons that have nothing to do with wine.