Claiming to be the oldest hat store in the world, this historic haberdashery had a hand (and a head) in the creation of the Bowler.

Giant, friendly pelicans in Central London, the most unlikely of places.

This luxury shopping lane has been protected by its own tiny police force for over a century.

Hear the quietest sound from across the dome.

London's smallest police station is barely the size of a phone booth.

A tongue-in-cheek arcade where the games are based on everyday life.

A cluttered and astounding collection of antiquities and curiosities.

Catacombs turned marketplace.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

The commemorative stone column conceals a secret laboratory.

A letterpress workshop committed to the art of printing, with unique and creative designs.

A sudden forest of traditional Papua New Guinean art works is hidden in a corner of Stanford University.

For more than a century, revolutionary graffiti has marked the wall of a Parisian church.

Known as the "Dodo Manège," this carousel features a herd of animals that have disappeared—or may be gone soon.

Rodin's famous depiction of Dante's 'Inferno', amidst a sculpture garden of many of his other works.

Sofia's legislative center is continuously reinventing itself.

A striking symbol of the Bulgarian capital.

A vast Communist-era exhibition space in the Bulgarian capital.

A Bulgarian monument to Russia's role in World War II is constantly being painted in pop culture protest.

"Holy Wisdom" overlooks the city that became its namesake.

Paris' linguistic guide to the international language of, yes, love.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

Abandoned railway line circling the city of Paris.

A model train wonderland hidden beneath Gare de l'Est station.