The 1936 Summer Olympics site is a crumbling remnant of sportsmanship and a history its host country would like to forget.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

This iconic 1,000-year-old medieval castle is a favorite of the film industry, most notably as the location for Hogwarts in Harry Potter.

The Arctic Archipelago is home to world's largest third order island: an island in a lake on an island in a lake on an island.

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

A hidden "place of interment for gentlemen."

Relics given to a Manhattan church to avoid seizure by the Italian government.

The oldest surviving synagogue in New York City is now a soaring art space.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

A Museum of Psychiatry in a still-operating mental institution.

The history of the treatment of mental illness, illustrated in all its gory detail, and housed in an asylum.

Former self-sufficient mental institution now a planned community.

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

Abandoned cemetery of the former Psychiatric Hospital of Volterra.

This former insane asylum now holds a pathological anatomy museum.

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

A formerly abandoned mental institute, now back in business.

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

Venice's "Island of the Mad."

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

An institution that preserves the history of institutionalization.

The mental institution where Van Gogh created some of his most famous work now allows guests to walk in the artist's footsteps.

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