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

An effigy of a trapped paratrooper dangles from a Normandy church to commemorate one remarkable D-Day event.

These unique markers designate the route American forces took during the Liberation of France.

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.

One of the oldest and largest wooden churches in France was very evidently constructed by shipbuilders.

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.

A quaint medieval millhouse hovers surprisingly above the waters of the Seine.

Rainbow arches made of shipping containers grace the entrance to one of France's largest seaports.

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

Tables of secondhand books fill the inner courtyard of this 17th-century stock exchange.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

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

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

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

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

A wonderfully eccentric Victorian-era museum and library.

A defensive structure built during the Hundred Years War has remained useful in one way or another for nearly 700 years.

A remarkable feat of Victorian engineering across the Firth of Forth.

The discovery of this Neolithic settlement, which contained a Stone Age "cathedral," threw archaeologists for a loop.

A red sandstone freestanding monolith rises out of the sea in northern Scotland.

The true age of this ancient stone circle is unknown, but its stunning vista isn't in question.

Thanks to both terrific preservation and historic vandalism this ancient site is known as the "Heart of Neolithic Orkney."

Possibly the oldest of Britain's ancient henges is also one of its most stark.