This abandoned amusement park was built on a site with a dark history.

This former fascist summer camp was abandoned for decades.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

An institution that preserves the history of institutionalization.

This amazingly preserved Gold Rush town is a historian's dream.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

A long abandoned hospital building on the outskirts of NYC.

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

This once luxurious Catskills resort is now a haunting ruin.

This hospital helped pave the way for treatment that drove down child-mortality rates in 19th and 20th centuries.

An ambiguous ambience emanates from this centuries old leprosy quarantine.

The bones of an old zoo crumbling in the shadow of a new one.

Dilapidated ruins that once treated a notorious young serial killer, currently hosting vandals, squatters, and ghost hunters.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

Secret Manor, a house full of legends, the least of which is the haunting of long-deceased ladies of pleasure.

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

Venice's "Island of the Mad."

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

A formerly abandoned mental institute, now back in business.

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

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

Underground hospital complex constructed by slave laborers during the German occupation of the Channel Islands.

Empty since 1989, now falling into ruin.

An abandoned asylum incorporated into a college campus.