This 21st century cabinet of curiosities includes dinosaur bones, moon rocks, film memorabilia, and more.

A mysterious artist-run cabinet of curiosities and library.

France's most famous cemetery, with some of its most curious tombs.

An architectural marvel that spans the Arda River, and has stories of a haunted past.

An ancient Viking runestone hidden in plain view in Stockholm's old town.

Sweden's "good old days" painstakingly re-created in a model village.

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

Now a hotel, this former bank was the site of a robbery that spawned a psychological phenomenon.

Stockholm's deepest subway station is also a stunning ecological wonder.

The world's largest model of our planetary system.

A rare surviving Victorian greenhouse designed specifically to house giant water lilies.

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

Dine on food tied to Viking history and legend at this subterranean Stockholm spot.

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

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

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.

Old neon signs from the City of Brotherly Love provide a snapshot of the city’s evolution.

Located in a veterinary school, this macabre exhibit displays the effects of animal diseases.

The oldest continuously operating pharmacy in Europe.

Ukraine's oldest operating pharmacy now offers guests a fascinating walk through apothecary history.

A forgotten graveyard lost in the tangles of an overgrown garden.

Nestled in the heart of Milan is a real wunderkammer of morbid curiosities.

"The prettiest love letters in the world" ... or so said Lord Byron.