A 100-foot-tall mural in South Australia.

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

This copper-coated, multi-arched dome is surrounded by a moat and lights up at night.

The gigantic preserved heart of a champion racehorse.

From a distance, this statue of an eagle looks like a giant chicken on a stick.

A beautiful 1920s tower filled with local hidden gems.

Once housing children next to hardened criminals this historic jail once displayed Ned Kelly's skull until it was stolen.

Every hour a secret compartment drops from this giant pocket watch, revealing a lovely surprise.

This historic Melbourne bullet factory is fully encased in a massive glass and steel cone.

Home to Alan Turing, the cracking of the Enigma code, and Captain Ridley's shooting party.

A famous burial ground with a history both grim and literary.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

Pop culture has helped to keep this iconic British building from being destroyed.

The sixth of London's "Magnificent Seven" cemeteries, and a source of unlikely inspiration to Beatrix Potter.

Only a few pieces remain of the structure that carried people and goods across the Thames for some 600 years.

This legendary stone is of unknown origin, and throughout history has been a literal touchstone for British leaders.

This one has sailed five times as far as Sir Francis Drake's famous ship.

The site of London's first coffee house has been serving refreshments of one kind or another for 360 years.

Rebuilt remains of a temple to Roman god Mithras.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

Charles Babbage's proto-computer, painstakingly brought to life.

This museum inside a museum tells the story of London's timepieces.

A clock designed to run with perfect accuracy for 10,000 years.

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.