Ancient cave tombs known as the "houses of fairies."

Water and windows define this defensive Italian well.

These gutted monastery ruins still stand proudly in the middle of the Italian countryside.

These delicate sand pyramids look like naturally occurring gothic spires.

A sulfuric hellscape in southern Italy.

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

A volcanic old faithful, Stromboli has been erupting continuously for the last 2000 years.

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

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

The astonishing collection of an infamous criminologist.

David Sedaris called it "The greatest shop in the world."

Skulls from the plague of 1656 and World War II bombings are united by a cult dedicated to caring for the ancient dead.

Where Aleister Crowley taught magick in "La Chambre Des Cauchemars," his "Chamber of Nightmares."

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

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

An Italian hillside ghost town.

Abandoned medieval hill town.

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

Geothermal waterfalls in Tuscany.

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

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

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

A submerged archeological park still holds the wonders of a Roman Sodom.

A wood-and-steel sculpture garden featuring an artful interplay of nature and machinery.