During World War II, Austria's oldest salt mine was used to store thousands of pieces of stolen artwork.

This museum dedicated to the history of the medical bone trade and human osteology.

In the heart of Luxembourg's "little Switzerland" weaves a breathtaking natural sandstone canyon with a mythological past.

Designed to allow funerals to proceed over the River Dulnain.

Spend the night in this former asylum for the incurably insane, which claims to be one of the most haunted places in the United States.

The abandoned tuberculosis sanatorium is said to be one of the most haunted places in Canada.

This abandoned hospital is one of the most haunted places in Costa Rica.

Locals believe this abandoned ruin on the outskirts of Bucharest is haunted.

The sister plane of the C-123 shot down during the Iran-Contra Affair has found a new purpose in retirement.

Where dogs like the rare "Fire-Tailed Border Cocker" run free on the mountainside.

The spectacular and eerie moss-covered grave site of 19th-century Belgian merchant.

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.