This gallery commissioned by Cardinal Spada is known for its magnificent optical illusion.

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

This small Roman arch was transformed into a dwelling by the founder of the Trinitarian Order.

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

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

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

An ancient Egyptian obelisk is now used to commemorate fallen Italian soldiers.

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

This Roman theater was crafted into the local tuff rock and was rediscovered during the 19th-century.

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

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

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

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

This crescent-shaped beach is said to glow under the light of a full moon.

This museum located in Fondi is also said to be the most haunted building in town.

This tiny chapel atop a sea stack is dedicated to the patron saint of Ponza, Saint Silverius.

This ancient Roman bridge was a key feature of the ancient Via Salaria road.

These artificial caves crafted by ancient Romans were elaborate fish farms for moray eels.

This abandoned semaphore station hearkens back to the days of the optical telegraph.

This lake was sacred to the Sabine people who constructed a temple here on a floating island.

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

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

In the early Roman Empire, people deemed traitors and criminals were tossed to their deaths from this rock.

This megalithic tomb was crafted by a mysterious civilization that settled the island of Pantelleria.