This real life asylum of horrors is now an abandoned ruin that hides the unbreakable code to one patient's insanity.

The remains of a town so thoroughly destroyed by French forces that the citizens simply left.

The world's largest historic armory was established by independent citizens to defend themselves from the wars of larger forces.

The personal charnel house of Anton Bruckner.

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

Extensive private collection of authentic Medieval devices used for human torture and execution.

Museum dedicated to wax representations of disfiguring diseases.

An architectural marvel that spans the Arda River, and has stories of a haunted past.

The deserted remains of a luxury hotel turned hospital ward.

A Franco-era dam flooded (almost) everyone out of this centuries-old Aragonese town.

On the coast of Sardinia, a once-great mining village is finding new life as a coastal resort town.

Abandoned village in Sicily built during the agricultural reforms of Mussolini.

This entire town moved to a safe location after it was devastated by an earthquake, but the remains of the original town are still around.

The ruined remains of the airport Claus von Stauffenberg departed in his failed attempt to kill Adolf Hitler.

This field of half-buried stone crosses was the burial place of a sect of heretical gnostics.

This constantly evolving art space saved an Italian town from its own crippling reputation.

Haunted tuberculosis hospital built by the patients.

An abandoned set from the 1980 film "Popeye," claimed and repurposed as a theme park by creative locals.

Considered the birthplace of the Copper Age and Bronze Age, the river is tinted red from 5,000 years of mining.

Abandoned Roman Catholic chapel abused by Satanists before being restored.

Burial grounds for more than 1,000 bodies deep under the modern town of Rabat.