Dictionary Johnson’s favorite feline.

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

Abstract dinosaur models in London.

Scattered throughout London are ancient remnants of the city's former bounding wall.

The remains of Crystal Palace Great Exhibition of 1851.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

Hear the quietest sound from across the dome.

The largest of London's subterranean rivers and once a mad, bad center of London life.

An unusual round church in London with a Templar past.

A relic from one of London's worst 19th-century slums.

Where Aleister Crowley attempted to seize the Hermetic Order of the Golden Dawn in a mask and a kilt.

Brisbane's manmade urban beach has enough water to fill five Olympic-sized swimming pools.

The footprint of a frustrated devil in Munich's Cathedral.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

A stairway to heaven, or to nowhere at all.

Though considered an eyesore by some, this boxy Brutalist high-rise plays a significant role in Sydney's past.

Final resting place for hundreds of prisoners of war.

A huge stone pyramid built for fun.

The once-dying town of Sheffield, Tasmania has reinvented itself as a village of painted wonders.

This controversial museum includes such detested exhibits as a chocolate suicide bomber and fecal-smelling digestion machine.

A giant Australian fruit and tropical farm.

One man's artistic vision is a small town government's legal battle.

Started nearly 100 years ago, this science experiment just keeps on going, ever so slowly.

Relics of Australia's convict past, and a modern scene of unimaginable horror.