The encased skull that is widely believed to belong to St. John the Baptist.

A sublime medieval path adorns the marble floor of one of the most beautiful Gothic cathedrals in France.

His "Lionheart" is entombed separately from the rest of his body.

An ancient ossuary in Rouen.

This medieval tower is all that remains of the castle where Joan of Arc was held before being burned at the stake.

A French museum of wrought iron.

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

This enormous "cloth of the conquest" depicts the Norman invasion of England in mind-blowing detail.

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

This symbol of the French Revolution still stands where it was first planted during the 18th-century.

This striking observation tower shaped like a spinnaker sail is the newest icon in historic Portsmouth.

This London plaque marks the spot where David Bowie's famous alien made his debut.

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

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

At the center of London’s oldest roundabout stands an obelisk that was erected in 1771, but spent several decades elsewhere.

A recreation of a sign that Charles Dickens used to see on his walk home.

This Underground station has been a popular filming location for decades, even before it closed.

This ancient Egyptian obelisk still bears the wounds of World War I.

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

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

A sculpture outside London's oldest cathedral honors the Mohegan chief who died while petitioning the king.

With a history stretching back to the 16th century, this pub has a few stories to tell.

The oldest standing structure in downtown San Diego.

These two K-9 memorials commemorate the sister cities of Edinburgh and San Diego.