A state-of-the-art medical facility from the Imperial era is now a derelict ruin.

Tiny memorials honor individual victims of the Holocaust.

This water-tower-turned-high-end-apartment building was once the site of an early Nazi concentration camp.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

A fascinating insight into daily life in the Eastern Bloc.

For more than a century, Parisians have come for affordable dishes in a grand converted train station.

Grab a life-changing ham sandwich at this former horse butchershop.

Pitié-Salpêtrière was the dumping grounds for women who received the dreaded diagnosis of "hysterical."

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

This massive mural by famed pop-artist Keith Haring was hidden for almost 30 years until its 2018 rediscovery.

A daring D-Day assault by U.S. Army Rangers is commemorated atop the high cliffs of this strategic point.

A museum dedicated to one of Paris’s most famous residents, tucked into a corner of one of the city’s most famous squares.

Former hunting lodge of a duke who was an avid collector of impressionist works.

Saintly bones pressed into a wax effigy of a Catholic superstar.

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

The Lone Star plaque hangs in a bombed-out bunker in Normandy to honor a Texan colonel's heroic actions on D-Day.

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

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

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

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

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

The industrial architecture honors the laborers who brought the Exposition Universelle of 1900 to life.

Two awe-inspiring globes from the reign of the Sun King hang from the ceiling of France's national library.

This structure atop a craggy cliff in one of the most beautiful parks in Paris boasts an unbeatable view.