The first Russian Orthodox church in the Catholic city of Rome in almost a thousand years.

One of the most important yet well-hidden museums dedicated to the history of medicine.

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

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

More sculpture than building, this architecturally significant temple was built on the spot of Saint Peter's crucifixion.

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

This large, circular tomb is the final resting place of the first emperor of Rome.

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

Remnants of a 4th-century church with vivid medieval frescoes and ancient sarcophagi hide beneath this old basilica.

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

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

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

A burial vault located under Tiber Island in the middle of the Italian capital.

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

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

This small church was constructed over the ruins of three temples dating to the Roman Republic.

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

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

A rare example of a medieval house in Rome adorned with a melancholic inscription.

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

The underground sanctuary of a mysterious ancient cult.

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

This ancient Roman prison is decorated with an upside-down cross not as blasphemy but as saintly tribute.

This ancient market is often referred to as the oldest shopping mall in the world.