A church of bones, decorated with 40,000 human skeletons.

An early Portuguese serial killer's head is alarmingly well preserved in a jar at the University of Lisbon.

This embalmed man is one of the best preserved mummies from the Canary Islands.

Stuck in the middle of a modern Madrid city block are the remains of a 19th century sports complex.

Commonly acknowledged as the only public monument to the Devil himself.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

This cemetery features modernist statues as strange as its name.

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

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

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

This fairy-tale castle would make Dracula (who is said to have been imprisoned there) jealous.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

This attraction was abandoned after the Chernobyl disaster.

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

Dug as a secret royal escape route, the tunnel became a wartime bomb shelter and dumping ground for vintage cars.

A self-built mosaic house and sculpture park.

The curious underground history of keeping Paris clean.

An astounding collection of medical specimens, including bits of President Lincoln.

Fiji mermaids, mummified remains, and recreated cryptids are among the morbid oddities at this Maryland museum.

A wunderkammer of mysterious objects and stories.

A surreal museum of extraordinary industrial objects.

A 200-year-old prison that now houses a peculiar crime museum.

This grim museum collects artifacts and evidence of some of the most sensational antipodean crimes.

A treasure trove of pathological, forensic, parasitological, and anatomical specimens.