An opal mining town in the middle of Australia where people live, worship, and shop underground.

This extraordinary geological oddity resembles human-made pavement.

This gracefully curving formation looks like a massive wave that was suddenly turned to stone.

The tallest sea cliffs on the Southern Hemisphere are a climber's worst nightmare.

A castle hand-built by a Spanish dreamer in the Australian tropical jungle.

A small, but award-winning beach known for its literally spotless reputation.

This dramatic sea spire is home to the world's rarest insect and is part of the lost continent of Zealandia.

An Australian lake whose pink hue defies scientific explanation.

A beautiful, but toxic, lake formed by mining.

These tracks are believed to be from a panicked dinosaur stampede.

A plaque at the lighthouse where Frederick Valentich made his last radio contact before he vanished without a trace.

A clear example of the process of erosion in action.

An incredible garden taking over the interior of a massive sinkhole.

"The Wonder From Down Under," a worm shaped museum celebrating the endangered Giant Gippsland earthworm.

These naturally occurring but rare geological formations are each about the size of a small house.

Australian Lake set aglow by Noctiluca Scintillans.

Bomb tests and sheep ranchers share the world's largest military land base.

An obsolete form of timekeeping still marks the hour in this adapted 19th century lighthouse.

A collection of outdoor mystical statues paying homage to indigenous Australians and ecological stewardship.

A local landmark that has become a hub of graffiti and urban exploration.

An abandoned jewel of a ballroom on the top floor of Australia’s busiest rail station echoes with the sounds of a bygone era.

This piece of Australian modern art is part joke and part history.

The labyrinthine storm tunnels beneath the city of Melbourne are ruled by a band of urban explorers.

A friendly monster lurks outside the State Library Victoria.