Installed at a chaotic intersection, this gave London traffic cops a place to hang their heavy woolen coats.

Colorful murals by Jean Cocteau hide within this peaceful London sanctuary.

This artificial lake surrounded by Brutalist architecture served as a stand-in for futuristic Britain in Stanley Kubrick's 'A Clockwork Orange.'

The wooden telephone box hidden away in London's Piccadilly was the original prototype of the iconic kiosk.

This London plaque marks the spot where David Bowie's famous alien made his debut.

Tucked away in a London Tube station, this 1920s linear clock shows the time across the world all at once.

A hands-off space for graffiti artists to hone and display their skills.

Run by the same people as a subterranean art space, this pub does double-duty as a Cave of Wonders.

The broken skateboards that became a poignant memorial to a murdered skater.

A friendly pub with a sordid past in cock fighting.

This building contains a door only used by members of the royal family.

Dictionary Johnson’s favorite feline.

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

This inn of the court provides a fascinating window into London’s legal and architectural history.

This artist's home turned gallery/museum preserves the creator's love of "Eastern" influences.

A little slice of Japan and its aesthetics in London's Holland Park.

This statue in Holland Park might be one of London’s oldest outdoor statues, but its exact origins are unknown.

These ancient artifacts are a testament to the enduring significance of the bull in Spanish culture.

One of Madrid's oldest trees, with a long and colorful history, resides in El Retiro Park.

The only urban monument in the world designed by the great surrealist painter Salvador Dalí.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

Commonly acknowledged as the only public monument to the Devil himself.

The remains of the second-oldest zoo in Europe can be seen within these library gardens.

Once a resting spot for King Fernando VII.