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

This hydrochronometer was invented by a Dominican monk and is a prime feature in this garden.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

The best preserved Paleochristian basilica in Rome hides a number of oddities and secrets.

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

An important example of architectural history slowly decays in the city center.

The oldest cemetery of modern-day Athens blends the modern and ancient worlds.

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

An eerie, little-known Neapolitan museum filled with preserved human remains.

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

Every day is like Christmas on this street where the traditional Neapolitan nativity scene comes to life.

Dug as a secret royal escape route, the tunnel became a wartime bomb shelter and dumping ground for vintage cars.

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

This magical-looking island is notorious for the misfortunes suffered by its owners.

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

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

The underground sanctuary of a mysterious ancient cult.

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

According to legend, this ancient column contains healing properties.

This striking sculpture of Icarus honors Greece's fallen flyers.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

This mystical orb covered in strange symbols is thought to have been used in ancient Greek magical rituals.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.