A Japanese video game arcade hides in the back of a Swedish pool hall.

Macabre museum devoted to historical Viennese murders.

The final resting place for the remains of 143 Habsburg royalty.

A small museum filled with over 1,000 clocks, and one particular clock calibrated to run until the year 9999.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

An architectural oddity hides in plain sight on this iconic London bridge.

The majority of the museum's large collection is held in a storage space open to the public a few times a year.

This museum tucked below a charming cafe gives a brief snapshot of photographic history.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

The 14th-century ruins are said to contain healing powers.

Street artists transformed an abandoned air vent into the beloved Star Wars robot.

Two monstrous faces loom over a village in Czechia.

Buried five stories underground, this Soviet bunker is packed with gas masks and Cold War paraphernalia.

A steampunk-styled three-floor factory churning out art, activism, and electronic beats.

Walk through Czech history in Prague's largest graveyard.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

A gorgeous stone viaduct crosses over a bucolic valley.

A line of disused military bunkers built to defend against Nazi invasion lies hidden on the outskirts of the city.

An abandoned 19th-century iron factory perched along the outskirts of an idyllic village.

An unusual cave filled with rare alien-looking aragonite formations.

This spaceship sculpture in the middle of the Slovakian capital looks like it just crash-landed.

The 700-year-old fortress was the site of Count Orlok's castle in "Nosferatu."

The abandoned military base looks like a post-apocalyptic wasteland.

A random tree outside a Budapest hotel has become a DIY shrine to the late singer.