These termites have an large and deadly abode—impressive by day, dazzling by night.

Venice's island of the dead.

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

A stunning cemetery famous for its extraordinarily delicate & lifelike mourning sculptures.

A dead saint, a deadly poison, and a mysterious holy ooze.

Mysterious tombstones thought to be remnants of Atlantis.

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

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

Abandoned cemetery of the former Psychiatric Hospital of Volterra.

Largest necropolis in the Mediterranean.

Jesus' footprints and the first catacombs in the world.

These "anatomical machines" are only one of the many strange items in this Italian crypt.

Thousands of well-dressed mummies below a monastery.

This Italian church is as beautiful as it is common, except for the real skulls decorating the many mannequins inside.

This artistic temple brings together multiple architecture styles, but is only an example of one.

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

Rome's ancient Etruscan rival, now a park full of ruins.

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

The plague quarantine island home to the alleged "Vampire of Venice."

The Neapolitan Cult of the Dead still cares for the skulls at this mini-Fontanelle.

The burial place of an obscure North African saint was turned into a macabre body preservation factory for the 17th-century Neapolitan elite.

The gravestones in this lost burial ground were bulldozed and replaced with houses and a dog park.

This strange example of the Egyptian Revival architecture trend now holds Mardi Gras floats.

It's clear this abandoned Art Deco gem was no ordinary cleaners.