Jesus' footprints and the first catacombs in the world.

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

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

2300-year-old Roman road connecting the empire.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

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

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

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

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

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

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

An abandoned socialist utopia built in the late 19th century.

The pile of books behind the dignified writer gave the statue a most undignified nickname.

Hanging within this medieval church are the bones of a beast allegedly slain by a fourth-century saint.

A special area of the National Archaeological Museum of Naples is located inside a metro station.

This Roman statue is missing a limb from when the Venetians stole it from Constantinople during the Crusades.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

Drink wine handed out through a window as part of an age-old tradition.

The famous sculptor left his mark on this Italian wall in an internationally protected example of street art.

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

The remains of the left arm of the levitating philosopher-saint are kept in a 13th-century Neapolitan basilica.

A popular legend claims that the famous pizza was invented at a restaurant in this alley.

An abandoned Santa park is as far as this proposed theme park kingdom got toward completion.