North America's oldest quarantine facility was built in response to Philadelphia's 1793 yellow fever outbreak.

Home on the Hillside, and home of the first breakfast cereal.

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

This abandoned psychiatric hospital once housed more than 4,000 patients in the middle of a quaint New England town.

A state-of-the-art medical facility from the Imperial era is now a derelict ruin.

A crumbling hospital from the 1850s on Roosevelt Island.

Now abandoned, the first public health hospital in the U.S. saw more than one million immigrants from around the world.

An institution that preserves the history of institutionalization.

A look into the Church of Scientology's deeply unfavorable view of psychiatry.

This prison-turned-museum is a remnant of the Old West's grizzly, violent past.

Once known as the Illinois Asylum for the Incurable Insane.

Former self-sufficient mental institution now a planned community.

A former insane asylum despised by Nelly Bly and Charles Dickens is now fashionable apartments.

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

This mouldering abandoned mental hospital was once a center for progressive healing.

St. Mary's Asylum was isolated and abandoned before being converted into a Bed and Breakfast.

This abandoned asylum in Wales might look haunted, but it's still beautiful.

Venice's "Island of the Mad."

Once a farm where patients tilled the soil, this asylum lost its workforce when overmedicating became common practice.

A beautifully designed asylum was resurrected as a hotel and art center with a ghost story or two.

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

This former abandoned hospital, a complex of stunning 19th century buildings, once housed 2,000 psychiatric patients.

Underground tunnels remain beneath this abandoned mental asylum.

An abandoned asylum incorporated into a college campus.