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

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

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

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

The world's largest "Christmas tree" is illuminated by hundreds of lights stretching 2,000 feet up the slope of Mount Ingino.

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

Things seem to roll, flow and run uphill on this short patch of road near Ariccia, Italy.

An incredible mosaic-lined monument said to have held the remains of an ancient Roman empress.

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

A narrow opening between the mountains of the Amalfi Coast creates a scenic hidden beach.

Once known for its horse-powered knife sharpening, this 200-year-old shop offers an array of blades and hard-to-find culinary tools.

This one-of-a-kind archeological site is home to strange prehistoric ruins, the original use of which is still a mystery.

This bustling Italian plaza is built on the ruins of an ancient Roman amphitheater.

This Italian stadium makes liberal use of fascist statuary to evoke classical sporting arenas.

One of the highest mountain passes in Europe has been ranked among the best driving roads in the world.

Also known as the Square Colosseum, this building is a prime example of fascist-era rationalist architecture.

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

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

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

Fountain where visitors can earn a license to be mad.

The steel cable lets adventurers zoom between two mountain towns at speeds of up to 75 miles per hour.

One of Catholicism's four major basilicas has a series of papal portraits that are said to predict the end of the world.

This park on the outskirts of Rome boasts two ancient Roman aqueducts and a medieval tower.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.