Iconic red and white plaques show the creative names invented to navigate the city streets.

The works of poetry's biggest names grace the walls of the city of Leiden, all carefully painted by hand.

This public toilet built in the famous Amsterdam School architectural style is a Dutch national monument.

This 11th-century castle sits so low you can't see it behind the surrounding buildings.

Once housed in the towers of this Gothic church, this 17th century clock still ticks today.

The discovery site of the "Capitalsaurus," the official dinosaur of Washington, D.C.

Thrilling and delicious complement to any dining experience.

A meow-velous tribute to a beloved street cat, made famous on the internet.

A century-old tradition has culminated in a small but singular collection of feline effigies.

These abandoned Cold War-era bunkers are now a designated refuge for endangered bat species.

A Cold War command center is hidden under an idyllic countryside.

This memorial to World War II's fallen airmen shows us the movements of the stars that once guided them.

This disused Cold War bunker has been restored to all of its early 60s glory.

A hidden alley in urban Baltimore is a haven for graffiti artists.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

A wooden street sign is the last remnant of this 400-year-old alleyway.

You won't find these curiously named passageways anywhere else in England.

This network of narrow, medieval passages has the most delightful name.

A beautiful ruin of a 14th-century Plantagenet castle built by a medieval mercenary.

It's believed King John of England stayed at this 13th-century castle before riding off to sign the Magna Carta.

One of the shortest streets in York has an especially odd name.

Follow the original medieval paths that wind through this intriguing section of the city.

The final resting place of England's most notorious bandit.

Wander among the abandoned ruins of this once-powerful medieval town.