This Renaissance square was at the center of Leonardo da Vinci's map, the first ichnographic ever.

Also known as "Hell Alley," this tiny street in Imola gained its name in a bloody episode in the 16th-century.

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

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

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

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

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

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

The mummified relic of St. Catherine sits forever on a golden throne.

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

An extraordinary collection of 18th century anatomical waxworks.

A gorgeous example of 13th-century Gothic architecture.

A whale rib was used to advertise the store by the arch that offered exotic goods from far away.

Pilgrimage site for star-crossed lovers.

A lively circle of dancers in the Georgian capital commemorates an ancient rite of spring.

With over 10,000 lights, this engineering marvel lights up the city after dark.

A small but hugely whimsical theater where marionettes play out the "The Battle of Stalingrad."

A cluster of historic bathhouses built on the famed hot springs that gave the Georgian capital its name.

The charmingly disheveled clock tower of Tbilisi's puppet theater.

An enigmatic monument to the Irish revolutionary who plotted an uprising against British rule.

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.

The modern birthplace of Irish freedom.

The block of aged dairy is probably still edible after 2,300 years in a peat bog.

The chaotic studio of one of the 20th century's most important artists has been preserved down to the dust.