Thousands of graves lurk below the surface of this park.

A medieval setting reimagined into a unique art alley.

This set of concrete chambers resonates according to different notes of octaves.

This medieval Estonian tower provides access to a series of tunnels that have been home to soldiers, punks, and fine art.

An underground nightclub helped spark a "Singing Revolution."

Only a fragment of this 15th-century Dance of Death survives today.

A secluded art gallery hidden within the cellars beneath Tallinn’s medieval monastery.

This free museum is building a collection of books that are banned, censored or burnt around the world.

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

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.

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

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 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.

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.

This zoological museum began as the first great curiosity cabinet.

An extraordinary collection of 18th century anatomical waxworks.

An amazing collection of wax anatomical models and terratological models.

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

A beloved local artist has been honored with this statue of a man emerging from a toilet.