A historic cavernous cistern lies hidden behind a wall at San Marino’s stamp and coin museum.

The smaller of the three towers of San Marino is a former prison inaccessible from the ground level.

Where members of the Crossbow Corps of San Marino demonstrate their skills.

A small window on Via Piella offers a lovely and rare peek at Bologna's lost canals.

The remains of an ancient Roman city are hidden underneath Bologna's beautiful public library.

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

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

A massive line that stretches across the floor of Bologna’s largest church was created by a 17th-century scientist to measure the movements of the Sun.

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

A diverse collection of wax, bone, papier-maché and mummified relics.

This building features dozens of faces along its facade, although one is a bit chilling.

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

Just across from the "Last Supper" painting is the famous painter's vineyard, a gift received for creating the masterpiece.

Invented in the mid-19th century, this machine could send copied images via telegraph lines.

The mark of the Devil's horns on a marble column in Milan.

More than 450 years ago, an Italian nun became the first woman to paint the iconic subject.

The middle finger of modernity.

Over 50 exquisite hand-painted Renaissance maps decorate a Medici storage room.

Secret refuge and museum of the Duke of Florence.

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

Renaissance hospital featuring a rotating door into which unwanted babies were dropped.

A plaque on the base of this statue holds a bewitching design.

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

Drink wine handed out through a window as part of an age-old tradition.