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

A sinister pyramid in the Frari contains the heart of the famous neoclassical sculptor.

Eco-village hidden in the foothills of the Alps that created a massive system of psychedelic underground temples.

Filled with goldfish swimming in a shallow pool of sea water, this ancient crypt is more wishing well than burial site.

The location of the last witch trials of Italy, known as "The Salem of Europe."

This sword isn't waiting for a king to pull it out. It was placed there by a saint.

This domed temple was built in a hidden cave mouth as a refuge for sinners seeking absolution.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

The abandoned "Ghost Mansion" was left to decay in the mountains of Northern Italy.

This 16th-century monastery has been turned into a surrealist architecture compound.

Go inside to really appreciate this 500-year-old technological masterpiece.

An Italian hillside ghost town.

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

Thousands of well-dressed mummies below a monastery.

As can be expected from a centuries old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

A 16th-century horror show built in a lovely Italian garden.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

An abandoned piece of phallic art repurposed by locals into a makeshift fertility shrine.

A complex, nine-layer maze on the grounds of a Venetian doge's playground.

Legend says the only thing buried within this magnificent tomb was a dog.

Built to repay the sins of the father, this church is home to one of the most valuable works of Western art.

A twisted steel beam from the wreckage of the World Trade Center is the centerpiece of this memorial for those who died on September 11, 2001.