An 18th century fountain and two columns are all that remains of Rome's forgotten river harbor.

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

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

Inside this McDonald's you can dine on your Big Mac and fries next to a 2,500-year-old Roman wall.

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

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

Architectureal fantasy quarter of Rome.

Legend says this mysterious stone head belongs to a woman who was petrified by an alchemist.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

The middle finger of modernity.

The famous sculptor left his mark on this Italian wall in an internationally protected example of street art.

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

Psychoanalyst Carl Jung reported a paranormal experience after visiting this mosaic-lined Roman baptistry.

Rome's first modern graffito is all that is left of a peaceful protest from the 1970s.

Mysterious tombstones thought to be remnants of Atlantis.

The world's first underwater farm is home to more than 700 plants.

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

The only museum with its curator—and her pets—buried inside.

A dreamlike medieval church dug into the tuff rock, with unusual carvings and possible traces of the Templar knights.

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

A line of abandoned, alien-like fortresses dot the mountains of North Italy.

Stumbling upon this whimsical wooded garden is like stepping into an enchanted forest full of philosophical musings.

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