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

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

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

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

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

In this Parisian garden's grotesque former life as a zoo it fed exotic animals to the bourgeois and put humans on exhibit.

This tiny cafe is one of the last meeting places of its kind, allowing revolutionaries a place to plot.

This ancient theater was once the home of fierce gladiatorial battles.

A memorial to the nearly 10,000 American soldiers laid to rest on the beaches of Normandy during WWII.

This bridge was constructed from the rubble of the infamous Bastille.

Fighting the British and making game shows for over 150 years.

These medieval ruins have survived since the 12th century, even providing shelter from the Nazis.

Even France's favorite aquatic son Jacques Cousteau, couldn't get to the bottom of it.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

There has been an astronomical clock on this spot since the 14th century.

This French castle is said to have once held the Holy Grail but is now a gorgeous mountaintop ruin.

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

At Monet's beloved home you can still see the Japanese bridge, waterlilies, and weeping willows that were the subjects of some of his most iconic paintings.

For hundreds of years, automatons moving to metallic music have been marking the passage of time.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

Historic medieval fortified city in southwest France.

This massive blockhead sculpture hides an entire library.

The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.