An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

Sitting on an Italian hilltop is this surreal fortress built by the mad inventor of electrohomeopathy.

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

The glowing blue Nymphaeum of Emperor Tiberius.

Venice's "Island of the Mad."

At the crypt of St. Mary of Eulogies and the Dead you are left alone to ponder mortality among piles of skulls.

The underground sanctuary of a mysterious ancient cult.

According to the local folklore, the myriad colors of this lake are the result of a lovelorn wizard's blunder.

Thousands of well-dressed mummies below a monastery.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

Architectureal fantasy quarter of Rome.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

Small on the outside, big on the inside, this church is an astonishing act of visual deception.

Eighteen mummies have stood guard behind the altar of this tiny church since 1833.

An underground paleo-Christian burial site composed of the remains of several cemeteries and Basilicas.

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

Cave shrine on Monte Pellegrino.

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

The mountaintop inspiration for Umberto Eco's "The Name of the Rose."

A fairy tale castle in modern Rome.

Sleep amongst an abundance of art from the modern era.

This one-of-a-kind archeological site is home to strange prehistoric ruins, the original use of which is still a mystery.

More sculpture than building, this architecturally significant temple was built on the spot of Saint Peter's crucifixion.

Architectural monsters are devouring this palace's every door and window.