The National Railway Museum in York is the largest railway museum in the world, attracting almost 1 million visitors per year.

An elaborately decorated house sits on an otherwise quiet street.

This semi-secret storybook hedge maze is also the oldest garden in the city.

Mountain where Jesus was first tempted by the Devil.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

Catalonia Tradition: Beating the hollow Christmas log until it defecates in your fireplace.

A spectacular cave and a beguiling lake.

These tombs were built into the side of a mountain so that ancient angels could reach the dead.

A Turkish ghost town abandoned in a population exchange with Greece.

The ancient latrines of the Greeks, in all their public glory.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

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

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

This tiered waterfall is so pretty it may cause visitors to cry tears of their own.

Buried in the Laos jungle is a sanctuary for bears that would have otherwise been milked to death by poachers.

A battle between nature and architecture in the Cambodian jungle.

5,000 skulls in memorial to those killed by the Khmer Rouge.

Khmer Rouge's high security prison.

An Orthodox church built by the Royal Family for the Russian community exiled to the French Riviera.

Metro station with a claim to rock n' roll fame.

Cold war icon and onetime "hole" in the iron curtain.