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

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

Stuck in the arcade of Casa Isolani are three arrows of mysterious origins.

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

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

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

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.

This 6th-century church has the largest and best-preserved collection of Byzantine mosaics outside Constantinople.

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

Genoa's collection of over 4 million zoological, botanical, and geological specimens from around the world.

Once home to one of the oldest banks in the world, this building is also where Marco Polo's famous travelogue was written.

This cathedral hides a sculpted dog that determines your fate and an unexploded shell from World War II.

After miraculously surviving a giant flood, the 19th-century nut tree and its offspring are protected with their own tiny park.

A notorious Route 66 eatery once frequented by Al Capone.

The red brick house where the father of rock 'n' roll wrote some of his classic hits.

Hundreds of graffiti artists have decorated this flood-wall on the west bank of the Mississippi River.

An abandoned factory along the Mississippi coated by a giant mural.

A late sculptor's last project was to turn this abandoned cement factory into a castle-themed amusement park.

Though it's thrived abroad, this forgotten Dunkin' rival has just one store left in the States.

This is not your typical jungle gym.

This titanic oil company sign is a reminder of the Americana boom of the 1970s and also its commoditization.

Less a museum than a bizarre fantasy world created by artists and engineers.

This lake—the second largest in the state— was hiding historic treasures beneath its surface.