A curious collection dedicated to human and animal anatomy and pathology.

Three floors of musical instruments coming from all corners of the world and hundreds of years of musical history.

An overgrown and largely forgotten cemetery lies hidden within the outskirts of Amsterdam.

This basement museum explores the art and artistry of fascism.

Some 80,000 Delft Blue tiles line the inside of this Amsterdam walkway.

A hidden church in a hidden courtyard tells the story of the Miracle of Amsterdam.

This subterranean studio is filled with fascinating kinetic art.

A unique collection of gilded age mechanical pianos.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

This museum inside Amsterdam's largest cemetery explores how people deal with death.

This bird-loving brewery is situated in an old municipal bathhouse, nestled beside a 300-year-old windmill.

Famed for its pie, this eatery has a hidden tunnel that allowed Catholics to secretly walk to church during the Reformation.

A Portuguese Jewish cemetery filled with stunning grave monuments that date back to 1614.

This impressive collection of rare books on ancient mysticism inspired author Dan Brown.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

Cat art as far as the eye can see.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

Venice's island of the dead.

Hanging within this medieval church are the bones of a beast allegedly slain by a fourth-century saint.

The plague quarantine island home to the alleged "Vampire of Venice."

Originally a leper colony, the island is now an Armenian monastery that's home to an incredible manuscript library and eclectic museum.

The oldest of Venice's plague quarantine stations, designed to keep the medieval city safe from disease.