This hidden Art Nouveau courtyard is an opulent feast for the eyes.

100 year tradition of fist fights, marked by marble footsteps.

The world's most active stratovolcano is almost always erupting.

Secret refuge and museum of the Duke of Florence.

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

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

This ancient Roman prison is decorated with an upside-down cross not as blasphemy but as saintly tribute.

Bell tower juts out from a village buried under a lake.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

One of several skulls claiming to belong to the beheaded St. John the Baptist is on display at this Roman church.

One of the largest caves in the world open to the public.

Medieval torture techniques with a modern conscience.

This Tuscan lake hides a 13th century town that is still visible when the water recedes.

This picturesque Umbrian city has a subterranean side that has long remained hidden.

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

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

The giant skeleton sculpture is surprisingly well-traveled.

An ancient artistic garden parlor full of hidden water wonders.

A Nesting Doll of Churches.

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

Venice's island of the dead.

The astonishing collection of an infamous criminologist.

A sunken idol welcomes parishioners to Davy Jones' Locker.

This medieval Italian town is a sheer (and beautiful) cliffside defense.