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

A treasure trove of Renaissance-era funerary art in a Roman church built on top of Nero's grave.

This is the oldest Roman-made bridge in the city still existing in its original state.

This basilica is dedicated to two saints, one of which is known more for his famous quote.

The remains of this 2nd-century Roman temple are incorporated into a modern building.

This small, ancient Roman temple was once a church dedicated to the patron saint of penitents.

Romans decided this 16th-century "talking statue" was so ugly, they named it after a primate.

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

In Rome’s Jewish ghetto, a 200-year-old bakery still makes the neighborhood’s historic sweets.

This curious, round temple is the oldest still-standing marble building in Rome.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

A forgotten "city of water" underneath the famous Trevi district.

Brass cobblestones mark the places where individual Holocaust victims were taken from their homes.

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

A Nesting Doll of Churches.

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

Architectureal fantasy quarter of Rome.

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

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

The final resting place of the poets Shelley and Keats.

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

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

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

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