Street artists transformed this abandoned industrial neighborhood into one of Europe's largest graffiti exhibitions.

The mummified right fist of a 1,000-year-old saint-king sits inside an ornate golden reliquary.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

Sitting beneath an unremarkable residential building is a museum devoted to classic Pinball.

This Stockholm light tower can be controlled by anyone with a smartphone.

Although rarely used, there is still a hidden room for the royal family at the Stockholm central station.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

Sweden's first nuclear reactor, R1, can be visited 25 meters underground.

A hidden bathhouse in one of Stockholm's oldest and busiest neighborhoods is open to anyone who can find it.

It houses the remains of a 17th-century version of the Titanic.

An illuminated manuscript comprising the life's work of a lone monk, inexplicably decorated with a portrait of Satan himself.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

According to Hindu belief, this shallow island chain was created by a god with an army of monkeys.

A Bohemian "anti-hotel" offers off-kilter stays in Sri Lanka.

This mesmerizing architectural wonder will take your breath away with its unusual color patterns.

One of the few places where inexperienced snorkelers can spot a shark.

Once thought to be the Garden of Eden it holds a holy footprint claimed to belong to Adam, Buddha and Shiva.

An ancient stone fortress considered by many to be the eighth wonder of the world.

A contemporary art installation housed within a Gothic cathedral.

A collection dedicated to the treatment of disease, held in London's oldest hospital.

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

The remains of Crystal Palace Great Exhibition of 1851.

The final resting place to 300 Victorian-era pets hides inside the city park.

A historic London cemetery now serves as a nature park incorporating gravestones & memorial statues.