After mysteriously refusing to surrender at the end of World War II this sunken submarine was only salvaged in a search for Nazi gold.

19th century tunnels burrowed under Liverpool.

The remains of an encyclopedic sculpture garden later used as an internment camp.

A small house in Tazones, completely covered in shells.

Natural stone arches form a walkable "cathedral" at low tide, then disappear entirely when the water returns.

An isolated dive site teeming with cnidarians.

This sculpture is an instrument played by the swell of the seas.

This hospital once pioneered the use of electroencephalograms, but fell into maltreatment, abuse, and eventual abandonment.

Thousands of well-dressed mummies below a monastery.

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

An Austrian house of bones filled with hundreds of intricately painted skulls.

Underneath this small church are 15,000 bones, arranged by an obsessive academic.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

At the crypt of St. Mary of Eulogies and the Dead you are left alone to ponder mortality among piles of skulls.

Stalin's march toward a more modern USSR flooded a monastery, leaving a unique and extravagant nautical marker, "The Flooded Belfry."

A 400-year-old mummified arm dangles from the ceiling of St. James the Greater, serving as a warning to thieves.

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

A church dedicated to the Mexican skeleton saint.

A museum in the childhood house of a medical pioneer.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

Artfully arranged bones of 5,800 Austrians.

One of the best collections of wax anatomical models in the world.

Macabre museum devoted to historical Viennese murders.

Collection dedicated to funeral rites, equipment, and mourning rituals of the Viennese.