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

Clusters of abandoned buildings hint at the facility's 144-year history with psychiatric health.

Beneath the mossy overgrowth covering this once-sprawling campus lies decades of history and the secrets that come with it.

The inspiration for H.P. Lovecraft's horror stories and Batman's Arkham Asylum is now a condominium complex.

A formerly abandoned mental institute, now back in business.

An FDR-era tuberculosis sanatorium has stood abandoned in the suburbs of the U.S. capital for over 30 years.

The remnants of a wooden-hulled fleet built and abandoned in WWI, now home to a thriving ecosystem.

A derelict bit of transportation infrastructure hidden in the woods.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

The haunting, dilapidated remains of a former poorhouse on Staten Island's Greenbelt.

The loneliest island in New York.

Run by a eugenics advocate, this aging institution conducted secret radiation experiments sponsored by Quaker Oats.

The decaying ruins of Wales' first asylum for the mentally ill.

Historic psychiatric asylum and most-filmed location in the Great White North.

A particularly creepy abandoned hospital that sparks interest for lovers of the supernatural.

A long abandoned hospital building on the outskirts of NYC.

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

Unlike other abandoned asylums this empty institution welcomes visitors, just don't go in the buildings.

Decades after testing the polio vaccine on unwitting patients, this historic mental hospital sits in ruin.

Once a place of peaceful repose, this sanitarium now faces an uncertain future.

An abandoned asylum once on the cutting edge of lobotomies may be reborn as a Christian college.

An abandoned asylum where patients have been forgotten but their possessions remain.

The abandoned husk of a mental institution that failed to save a Jazz Age icon still sits nearly unchanged.

Silver in the hills led to the speedy creation of this boom town and a lack of it saw the town abandoned nearly as quickly.