Its appearance in "Game of Thrones" may spur on the long-awaited restoration of this medieval shipyard.

The world's largest wooden structure.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

A Jenga-style cylindrical tower of books that appears to go on forever.

Macabre astrological automaton clock dating to the late 1400s.

This World War II bunker now survives as a documentation of the Nazi regime and war crimes.

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

Tourists often confuse this beautifully ornate former cigarette factory for a mosque.

A poignant museum dedicated to the history of the Dutch resistance against Nazi occupation

Established in 1638 to battle the Black Death, this botanical garden is a treasure trove of rare flora.

The design of this beautifully crafted building was inspired by Norwegian glaciers.

At just 25 inches at its narrowest point, it's one of the tightest streets in the world.

This pub was 238 years old when it decided to revamp its image: It started serving Thai food.

The Columbia Road Flower Market is now open every Sunday, rain or shine.

London's old-school healing garden.

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

Eighty million natural history specimens call this gargantuan museum home.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

Banksy gives themself artistic license with this piece of London street art.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the first ‘Harry Potter’ film.

Sniff the Titan Arum's rotting flesh.

Ride the subways of yesteryear.