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

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

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.

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

Two gravestones clasp hands over the religious divide.

Chelsea's soldiers were given strict orders when crossing this historic bridge.

A mysterious shape catches the eye in this 16th-century painting.

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

Ship-sized kinetic sculptural fantasy.

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

19th century museum with an eclectic mix of curiosities, from Egyptian artifacts to items on archery history to the skull of the world's oldest horse.

Breathtaking and huge 430 year old maps of Italy.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

Known for centuries as the famous Roman emperor's burial place, this monument is actually something else.

2300-year-old Roman road connecting the empire.

One part local history, 99 parts gruesome haunted house.

Macabre astrological automaton clock dating to the late 1400s.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

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

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

Now harmless, this looming post struck fear into the heart of medieval troublemakers.

An ancient knight and a symbol of the city's freedom.

Gargoyle head that brings good luck.

A musical instrument played by the sea.