A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

A community of artists and entrepreneurs seeks a simpler life on London's waterways.

Pop culture has helped to keep this iconic British building from being destroyed.

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

Bronze sculpture celebrating the relationship between Churchill and Roosevelt.

After nearly 60 years, there's still a bear at Paddington Station looking for help.

The monster at the center of the Darwin Center Spirit Collection.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

The third tallest lighthouse in America once guided author Stephen Crane to safety.

A building so large that it has its own weather.

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

Eighty million natural history specimens call this gargantuan museum home.

London's smallest police station is barely the size of a phone booth.

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

Hear the quietest sound from across the dome.

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

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

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

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

The infamous Boston Mob ran rackets from an office here in the 1970s.

The former site of an all-but-forgotten colonial landmark is now remembered by an often overlooked bas relief.