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

A cluttered and astounding collection of antiquities and curiosities.

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

One part local history, 99 parts gruesome haunted house.

An unusual round church in London with a Templar past.

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

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

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

Famously misunderstood wonder of the ancient world

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

Sky ships, planes, and portraits left as unique tokens of hope and thankfulness.

The Argonaute submarine was the French navy's pride and joy in the 1950's.

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

This modern museum of Mediterranean culture is surrounded by a surreal concrete honeycomb.

Historic medieval fortified city in southwest France.

The famous winding walk at Chartres is surrounded in mystery and myth.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

Remains of the artificial harbours invented for the Allied invasion of Normandy can still be seen at sea.

The great Italian Renaissance painter was laid to rest here in the Chapel of Saint-Hubert.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

France's most famous cemetery, with some of its most curious tombs.

A series of abstract, silly sculptures represent the works of a great modern classical composer.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.