The city of Parma's cathedral is home to one of the greatest illusionistic frescoes of the Renaissance.

Destroyed numerous times, this centuries-old bridge has always been rebuilt with its original design.

Old batteries and frog skeletons reside in this lakeside monument to Alessandro Volta.

This medieval castle was home to a known tyrant and features several hidden passages.

A haunting collection of sunken wooden barges litters this Italian river bend.

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

In the past, Renaissance sex workers were encouraged to entice customers on this bridge.

Atop the former site of a historic bakery sit two stone tributes to Verona's contribution to traditional Italian baking.

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

A series of caves, tunnels, and wells filled with fascinating figures and symbols.

A long-buried ancient ruin unearthed right in the middle of the city.

A medieval, mosaic-lined baptistry built by a heretical Christian sect.

The roof of this ancient mausoleum is made from a single Istrian stone weighing a massive 230 tons.

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

Featuring the last fully walkable parapet walkway in Europe.

Next to the Leaning Tower of Pisa is a cemetery home to ancient sarcophagi and disturbing murals.

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

A local student's chance encounter with Keith Haring led to the creation of one of Europe's largest murals.

In Florence's great Duomo, a 26 foot fresco honors a mercenary famous for attacking Florence.

Known as the Royal Palace of the Euganean Hills, this often overlooked castle has been home for multiple noble families over the centuries.

A military museum, art park, mausoleum, and architectural oddity all on one fascist's estate.

When this funny little building went up in the 19th century, most people thought it would simply fall over.

On the shores of Lake Garda, the ruins of a Roman villa that allegedly belonged to the poet Catullus.

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