An abandoned railroad tunnel is now filled with bioluminescent bugs.

A sparkling sandstone cliffside that's worth a visit while it still exists.

One of Australia's largest secondhand bookstores.

A special train service transported Sydney's dead from this station to "Necropolis Receiving Houses" at Rookwood Cemetery.

The bones of this aquatic dinosaur turned to opal over the centuries and the beast's remains were almost sold as jewelry.

Final resting place for hundreds of prisoners of war.

Come for the flowers, stay for the bats!

This historic observatory contains the world's oldest refracting lens telescope.

The yawning remains of a complex naval fortress still haunt this Australian shore.

Built over an abandoned train yard, this hidden gem is full of winding paths and offers gorgeous views of Sydney Harbour.

Cockatoo Island is a Heritage-listed island in the middle of Sydney Harbour.

Nature is leading a successful mutiny on this century-old freighter.

Once the path of a railway tunnel, now home to thousands of glowing insects.

By standing on a particular paving stone in the courtyard, you'll hear an echo that shouldn't be.

A wonder of natural limestone formations etched by millions of years of natural interaction between rainfall and rock and air.

6000-year-old coal fire moves one meter per year.

The longest manmade tunnel in Queensland is now a beautiful trail, home to a special colony of bent-wing bats.

The 25-million-year-old cavities have perplexed people for decades.

Just one of many oranges on this citrus-happy continent.

In this Red Rock forest, a small enclave plays host to a collection of wacky figurines.

One of the first big sculptures anywhere in Australia.

The only pollutant in the clear blue water is sunscreen.

This abandoned railroad tunnel is now home to a micro-colony of bats and a ghost train.

There's nothing shrimpy about the world's largest artificial prawn.