Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

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

Believed to be the remains of the lost Temple of Minerva, this nymphaeum has been known by its misnomer to this day.

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

The former home of an Italian artist is now a shrine to his ambitious works.

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

A huge enchanting public park just outside the ancient walls of Rome.

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

Among the busts of heroes of the Roman Republic of 1849, there is also a statue of a boy and his dog.

The Italian revolutionary's legendary wife is portrayed on horseback waving a gun and holding her child in this memorial on the Janiculum.

The charred, dead skeleton of an oak tree is said to have consoled a dying 16th-century Italian poet.

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

These spartan apartments are provided to clergymen visiting Vatican City.

If you want to talk to the Pope you will have to stare down this surreal vision of Jesus rising from a nuclear hell.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

This equestrian statue of Constantine the Great has been the subject of criticism for centuries.

A hidden workshop for creating and restoring Papal mosaic masterpieces.

The Vatican's secret porn-festooned bathroom was painted in erotic murals by one of the greatest artists of the Renaissance.

Breathtaking and huge 430 year old maps of Italy.

A large replica of a monumental Roman inscription is located on the side of this museum.

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.

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

Inside this building is another country within Rome, a sovereign entity without a physical territory.