The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

A state-of-the-art medical facility from the Imperial era is now a derelict ruin.

Super-heavy Nazi architectural experiment.

Home to 10,000 medical specimens including the remains of Rudolf Virchow's extensive collection of pathological specimens.

The music is over at the Ballhaus Riviera Ballroom, but the ballroom remains in haunting disrepair.

The lost American era of gunfighters, bandits, Indians and steam trains is recreated in Sweden.

Winter roadtrips are a little more exciting on this seasonal, slippery expansion of Sweden's national highway system.

A Chinese meditation center in the middle of rural Sweden, partly funded by a member of ABBA.

Home to 200 plaster casts of Scandinavian proboscises.

The place to be if you love vintage Swedish cars.

The remnants of a record-setting industrial bucket system can still be found dotting the Swedish countryside.

A former hen house turned curiosity cabinet displays one man's lifelong fascination with cannibalism.

From under the bed of one of the co-founders, this server helped launch the notorious file-sharing website.

For a couple of months each year this Swedish city turns into a festive neon phantasmagoria.

A memorial to a Swedish hockey player's "encounter" with aliens.

A botched 18th-century canal silenced one of Sweden's most magnificent waterfalls.

Tiny Swedish village with a distinct local phenomenon known as an "Elk Shower."

No one knows who's responsible for decorating this tunnel with stuffed animals, but the people love it enough to protest their removal.

This wonky bit of historical taxidermy is experiencing a second life online.

According to legend, this boat-shaped henge is built over the grave of a mythic king.

A nightly tradition fills the streets of Flogsta with a collective scream.

This luxury hotel suite is located deep in the bowels of an old mine.

A peat bog in southern Sweden provides a cozy and photogenic home for junked Volvos, Saabs, and the occasional American muscle car.

Once the nail factory shut its doors, this Swedish factory town was abandoned, leaving behind a modern ghost town.