Ever hear of the Milazzo Cage?

This hill made entirely of ancient Roman jars was simply a garbage dump to the people of the time.

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

The mystic whose incorrupt corpse still attracts the faithful.

Charles Dickens was not a fan of the ghastly wall dressings in this 6th century church.

Stone memorial that's said to predict the death of the pope and the site of the Cadaver Synod.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

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

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

The "Greatest Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

The underground sanctuary of a mysterious ancient cult.

The yawning maw of this pagan visage is said to bite off the hands of liars.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

A Nesting Doll of Churches.

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

One of several skulls claiming to belong to the beheaded St. John the Baptist is on display at this Roman church.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

This former Roman Catholic Church still contains the embalmed hearts and organs of 22 popes.

An alchemist's "magic door" stands in the middle of a Roman park.

Architectural monsters are devouring this palace's every door and window.

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

The martyr's wax-enhanced skeletal remains lie preserved in a glass case in the Santa Maria della Vittoria in Rome.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

The tower was originally used as a chimney for the waste incinerator of St. John's Precinct and Market.