17th century streets hidden under Edinburgh were once a breeding ground for the black death.

Known to backpackers as the "Steps of Doom," this walkway carved into the side of a seaside cliff leads to the Roman Tombs.

A 15th-century Corsican chapel that possesses a rare Catholic monument: a "Scala Santa," or "Holy Stairs."

Ancient Phoenician and Roman tombs carved into the rock overlook the Moroccan coastline.

Structure built from the skulls of vanquished foes.

Built in the early 70s, the ruins of dinosaurs are all that remains of a man’s dream to build a free dinosaur themed mini golf course

Across from a hotel parking lot, a Confederate spy rests under a large tombstone with her Union Veteran husband behind a copse of trees in a small, well-maintained cemetery.

Distressing images of the Last Judgement adorn the walls of this medieval sanctuary.

Built by an accountant with a dream of running a grand resort, this estate has sat vacant for over half a century.

The United States' only educational center specializing in disease vectors and mosquitoes.

Five painted skeletons are hiding behind a church in this tiny village in the Italian Alps.

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

The Tübingen University anatomical collection hosts an example of an extremely rare medical phenomenon.

A novel collection of medical curiosities housed in an 18th-century surgeon training academy.

The ruins of Brisbane’s own Alcatraz now sit in the middle of a national park.

A long-forgotten Victorian swimming hole is still a fun spot for a dip.

Long before ultrasounds and modern testing, medical specimens like these conjoined twins helped physicians learn about congenital anomalies.

Some of the specimens on display at the Leiden University Medical Center have been helping educate physicians since the 17th century.

This memorial commemorates where a Japanese commander surrendered to Allied forces on September 3, 1945.

Smoked mummies housed in mountainside caves.

Visit the final resting place of a potential pirate at this historic burial site.

Nearly 200 prehistoric giants lurk among the trees at this theme park.

An underground world of gorgeous, palatial metro stations designed as a nuclear shelter complex.

The island where one woman reigned as a "queen" over 30-odd Japanese soldiers who refused to believe that WWII had ended.