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

Ever hear of the Milazzo Cage?

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

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

Rome's semi-secret peephole vista is also a former Crusader stronghold.

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

Geometry and mystery come together in an epic show of octagonal masonry.

The glowing blue Nymphaeum of Emperor Tiberius.

The sign at the garden gate reads: "These Plants Can Kill."

Ancient snack bar of the Roman Empire re-opened.

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

Virgil's many-mouthed gateway to the underworld.

Pompeii's less famous neighbor is still revealing her secrets.

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

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

Large Hadron Collider and the Birthplace of World Wide Web.

Over 3km of caverns and caves at the Switzerland-France border contain the largest underground river in Central Europe.

The middle finger of modernity.

Museum celebrating the ocean, with the largest wunderkammer dedicated to sea exploration.

150-year-old satirical tableaus made from stuffed frogs.

Anatomical cabinet holds unexpected treasures.

Europe’s oldest natural human mummy.

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

A haunting collection of the vanished and disappearing natural world.