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

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

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

This zoological museum began as the first great curiosity cabinet.

An extraordinary collection of 18th century anatomical waxworks.

An extensive collection of reliquaries containing the bones of saints housed in the largest Catholic church in Venice.

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

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

In the world's oldest university is a stunning 17th century anatomical theater carved from spruce.

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

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

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

Once home to an aristocratic family and a workers' organization, this intricately tiled building now houses a chain restaurant.

Many people don't realize there’s a lot going on in—and below—the world’s tallest triumphal arch.

The artwork commemorates the many ways 20th-century people perished while on the clock.

A fantastic place to see murals, and an important location in the history of Toronto's legal street art scene.

One of the largest underground systems runs under Canada's largest urban center.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

This whimsical fountain pays tribute to Toronto's four-legged friends.

Museum precariously perched on a massive yellow pillar.

Solitary monument dedicated to the beauty of nature.

One of São Paulo's tight urban intersections has become a haven for graffiti artists ever since a single Batman started the trend.

A British general, a suggestive tree, a map of paradise.

This vestige of Seychelles’s colonial past now resides in a busy intersection and didn’t chime for its first 96 years.