This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

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

This basement museum explores the art and artistry of fascism.

A beautifully eclectic mix of architectural styles.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

Cat art as far as the eye can see.

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

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

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

Eighty million natural history specimens call this gargantuan museum home.

Hidden behind a wall for decades, this masonic lodge was only rediscovered during renovations.

Repository for more than 22 million pickled specimens.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

An unusual round church in London with a Templar past.

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

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

Since 1874, this macabre collection has developed into a museum devoted to Scotland Yard's mementos of dastardly deeds.

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

The world's largest statue of Mao Zedong looks out over the city where he discovered Communism.

Unique geological formations in China, featuring some suggestive shapes.

A Chinese mining company has created the world's first cloned village in this perfect recreation of an Austrian town.

Venture into the hideout of one of Hong Kong's legendary pirates.

This naval gun is fired every day at noon, an odd timekeeping tradition the origin of which is local legend.