Nestled in the hills of Tuscany are gorgeous, multicolored hot springs.

This long-hidden space above Westminster Abbey now displays the battle gear of the legendary King Henry V.

This bridge was constructed from the rubble of the infamous Bastille.

This demon atop the Notre-Dame de Paris looks utterly bored.

For hundreds of years, automatons moving to metallic music have been marking the passage of time.

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

On Gellért Hill, this statue depicts the tragic tale of lovers divided by the Danube.

This memorial to a murdered empress took 20 years to design, then spent 30 years hidden away in storage.

This easily overlooked memorial immortalizes the scars from the 1956 Hungarian Revolution.

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

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

Featuring one of the oldest collections of historic musical literature in the world.

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

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

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

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

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

One of Bristol's best-hidden gems has ties to Lord Byron, whence it became the nation's first reformatory school for girls.

After protestors toppled a statue of a 17th-century slave trader, the pedestal where it once stood remains unoccupied.

The video game-themed street art first popped up in the French city.

A plaque claims this artwork outside a children's hospital was used in the 1998 Quidditch World Cup.