Where Venice's gondolas go for a tune-up.

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

A sprawling collection of books and manuscripts about ancient Greece that would have put their famed libraries to shame.

This artist's home turned gallery/museum preserves the creator's love of "Eastern" influences.

A naturally mummified 2,000-year-old man.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

The sixth of London's "Magnificent Seven" cemeteries, and a source of unlikely inspiration to Beatrix Potter.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

An alleyway plaque is all that remains of the independent Texas' envoy that forgot to pay their rent for over a century.

A cluttered and astounding collection of antiquities and curiosities.

Hear the quietest sound from across the dome.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

The anatomical-pathological collection of a man who changed surgery.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

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

An amazing collection of wax anatomical models and terratological models.

Virgil's many-mouthed gateway to the underworld.

Italy's "New Mountain" rose from the ground in a volcanic eruption in 1538.

A sulfuric hellscape in southern Italy.

In a city that boasts four separate inclined cable railways, this is one of the busiest funicular lines in the world.

An underground paleo-Christian burial site composed of the remains of several cemeteries and Basilicas.

These "anatomical machines" are only one of the many strange items in this Italian crypt.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.