A sulfuric hellscape in southern Italy.

Gigantic mosaic sculptures of the figures on Tarot cards fill this colorful Tuscan garden.

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

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

Medieval torture techniques with a modern conscience.

This half-finished "city of toys" was almost Italy's own Las Vegas.

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

The astonishing collection of an infamous criminologist.

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

A collection of objects supposedly singed by the hands of souls in purgatory.

Abandoned medieval hill town.

An Italian hillside ghost town.

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

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

The neon signs from Las Vegas' past find their final resting place at this unusual graveyard.

Abandoned for decades, trains still pass through the now-restored remains of one of Madrid's first metro stations.

Week-long block party becomes a competition for the best decorated street.

St. Francesca Romana, patron saint of drivers, resides in the church she founded.

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

One of seven Jewish catacombs in Rome and one of only two open to the public.

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

Architectureal fantasy quarter of Rome.

The oldest operating pharmacy in the world features 800-year-old recipes.

This courtly monument celebrates an influential comedian who turned taking the piss out of the powers-that-be into an art.