A large statue of Pope Gregory XIII in Bologna was disguised as Saint Petronius to avoid destruction.

A large portion of this navigable canal runs under Paris's famed boulevards.

A striking memorial recalls thousands of Bolognese men and women killed fighting fascists in World War II.

Legend has it this fountain built to symbolize the Pope’s power hides a strange secret concerning Neptune's manliness.

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

It took more than 300 years to build this church, which is home to two sacred vessels believed to hold the blood of Christ.

A room filled with frescos that make it seem like the walls are crumbling down while giants die in despair.

An architectural oddity where the triglyphs of the courtyard of walls create an optical illusion.

A medieval tower with a suspended iron cage used as an open-air jail for criminals who were exposed as a warning.

The oldest church in Mantua was buried for centuries under the facades of other structures.

Europe’s oldest natural human mummy.

Inspired by the more famous Scrovegni Chapel, Cappella di San Giovanni contains several amazing frescoes.

Former hunting lodge of a duke who was an avid collector of impressionist works.

Tables of secondhand books fill the inner courtyard of this 17th-century stock exchange.

Museum in a swimming pool where the water still flows.

Balconies that have a most unusual accent.

This facility has manufactured stunning tapestries for France's royalty ever since the 17th century.

A popular shrine where the Blessed Virgin allegedly appeared in 1830, displaying a holy armchair and two incorruptible remains of Lady Saints.

Saintly bones pressed into a wax effigy of a Catholic superstar.

Marie Antoinette and Napoleon Bonaparte were fans of this 200-year-old French chocolatier.

A simple plaque on the facade is the only reminder that the treaty ending the American Revolution was signed inside.

Explore this medieval cathedral by trying to spot all the malevolent monsters hiding in its beautifully colored windows.

There has been an astronomical clock on this spot since the 14th century.

A pink sandstone column once used in ancient times to measure one's belly after a night of debauchery.