These "anatomical machines" are only one of the many strange items in this Italian crypt.

Skulls from the plague of 1656 and World War II bombings are united by a cult dedicated to caring for the ancient dead.

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

This clifftop arch is a natural stunner.

A secret hatch containing two parchments was discovered in this statue over 40 years after its installation.

An unremarkable wooden wheel built into the side of one of Rome's oldest hospitals was part of a policy to reduce infant exposure.

This medieval church in Rome was almost destroyed following a terrorist attack in 1993.

A monumental fountain in Rome features a large statue of Moses that has been criticized for centuries.

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

According to local folklore, this Roman sepulcher was once a throne for the Devil.

Plaques on its facade commemorate the Tiber's most destructive deluges.

This statue is the only female representation of Rome's "talking statues."

A massive marble foot is tucked away in a small alley near the Pantheon.

This one-of-a-kind Roman arch is not actually dedicated to the god Janus.

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

An ancient Roman temple first dedicated to an emperor's wife is now a church.

A statue representing a lost Roman profession that was vandalized for centuries.

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

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

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

The only remaining arch of the oldest stone bridge in Rome stands in the middle of the Tiber.

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

A sculpture serving as an homage to Pope John Paul II.

A fortified medieval basilica on the Caelian Hill preserves extraordinary frescoes and one of Rome's most beautiful hidden cloisters.