This former wildlife sanctuary is being transformed into an art park.

This notorious Canadian mental institution was home to some of the first LSD experiments and origin of the word "psychedelic."

Former farm staffed by mental patients is now a public park.

A former mental hospital founded in the 1930s by a eugenicist who advocated for the forced sterilization of patients.

The name of this famed hospital was once a byword for the horrors of medical and psychiatric care.

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

This former tuberculosis research hospital endeavored to cure the dreaded disease with fresh air and positive attitudes.

This Queens hospital has stood abandoned for almost 20 years after its patients were secretly relocated in the dead of night.

One of the largest-ever mental hospitals now sits abandoned, surrounded by 25,000 unmarked graves.

Enchanting gardens surround a derelict mansion, all hidden in plain sight behind a stone wall.

On a dusty county road sit the ruins of a ghost town's abandoned church.

A miniature village lies nearly forgotten in the forest by the side of a major highway.

An eerie, abandoned military base engulfed by nature and graffiti is now home to a local park.

This once sprawling resort now sits abandoned, filled with graffiti and vibrant colors from an era long passed.

This historic Ohio bridge is adorned with fanciful locks left behind by loving couples.

An abandoned tuberculosis hospital moulders on into an uncertain future.

An overgrown and abandoned tuberculosis ward resides in the midst of a quaint modern neighborhood.

An abandoned observatory in the middle of the Illinois prairie.

Take a self-guided tour through one of Colorado's most elevated mining districts.

Standing for over 200 years, the abandoned home of a Revolutionary War hero and later a succession of prison superintendents.

The site of the notorious Camp Sumter Prison is now a peaceful memorial.

The history of those incarcerated in Singapore during World War II is etched into the bricks of a popular staircase.

The last of nine massive kilns that produced many of the red bricks for buildings in Washington, D.C. and northern Virginia in the early 20th century.

Once the central jail for Los Angeles, this building housed inmates like Al Capone, those arrested from the Zoot Suit and Watts Riots, and individuals imprisoned for their sexuality.