The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

Five candy-colored villages on the Italian Riviera.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

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

Rome's semi-secret peephole vista is also a former Crusader stronghold.

The medieval castle built as headquarters for the Pope's secretive Knights Templar.

His "Lionheart" is entombed separately from the rest of his body.

Hamburgers are intensely proud of their tunnel beneath the river.

A portly statue of a golden boy commemorates an unusual cause of the Great Fire of London: the sin of gluttony.

The childhood home of Earth's alien chameleon is a humble Brixton flat.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

Ship-sized kinetic sculptural fantasy.

A makeshift shrine to the late rock star is still kept up on the nondescript façade outside 1 Logan Place.

A collection of comics, graphic novels, animation and caricatures devoted to exploring this often overlooked art form.

Giant, friendly pelicans in Central London, the most unlikely of places.

The final resting place to 300 Victorian-era pets hides inside the city park.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

One part local history, 99 parts gruesome haunted house.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

Germany's Glienicke Bridge has a shady history of clandestine meetings, espionage, and spycraft.

This Berlin island is home to a flock of free-roaming peacocks, as well as a historic ivory folly.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

Beneath the impressive baroque cathedral that rises from the center of Berlin lies the largest collection of Prussian royals in the world.