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

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

This mountaintop mariner’s church is packed with model ships and nautical art while hosting an annual maritime festivity for the townsfolk below.

An image of the legendary saint stands in the shadow of a cathedral she liberated.

A Museum of Psychiatry in a still-operating mental institution.

After the construction of a nearby cathedral obstructed the view, the oldest belfry in Belgium was more than doubled in height.

These crumbling Nazi artillery bunkers are now fair game for massive graffiti projects.

This former cannon foundry and castle for the Counts of Flanders is now a public garden.

This traditional festival celebrates a family of wooden giants that have survived Nazis, wars, and religion.

One of the most notorious leaders of the French Revolution once lived here.

An underground city of ancient quarry tunnels hid thousands of Allied soldiers in WWI.

The 16th-century church was kept in its ruined state as a reminder of the casualties of World War I.

A monument to the thousands of Canadian soldiers who died capturing the French ridge during World War I.

The tomb of a hard traveling saint is constantly covered in shoes as offerings to heal disabled youth.

This bunker in northern France was built by Nazi German forces with the intention of launching up to 50 V2 rockets at London each day.

Built in 1347, this belfry is one of the oldest in the world and survived intense bombing during World War I.

The bronzed skull of a beheaded traitor was affixed to the city gate in the 17th century.

Christ's blood allegedly preserved in a Belgian town.

The celebrated eyesore created by starry-eyed sweethearts.

Montmartre's sole surviving windmill became an iconic landmark for 19th-century painters, artists, and bohemians.

During the summer months, giant teddy bears take over Paris near Les Gobelins metro station.

If you look closely at the oldest bridge in Paris, you might notice hundreds of ugly faces leering from its sides.

This lesser-known Frank Gehry building houses a treasure trove of cinema history.

What looks like a normal building is really a hollow facade hiding a subway vent.