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

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

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

The experimental test tracks of a retro-futuristic monorail still stand in the French countryside.

A clear example of the process of erosion in action.

Nine limestone rock stacks on Australia's "Shipwreck Coast."

A fountain standing as a testament to a doomed alliance.

Climb a steep hill in 90 seconds on the second-oldest urban subway in the world.

A pilgrimage site where people ask Saint Dymphna to watch over those who are not of sound mind.

This building once stood at the center of a butter war.

This residence straddles a border between Belgium and the Netherlands.

Not many houses move across borders, this one did it twice.

A reconstructed World War I-era communications array that was once hidden in plain sight.

A maze of crosses marks the jumbled divide between the Netherlands and Belgium.

A tribute to smugglers and the Butter Wars.

The tallest church in Mechelen might have been the tallest in the world if not for a lack of funds.

This fairy tale forest hides scenes from some of the more obscure and bizarre Western nursery stories.

Lavish royal estate punctuated with heated greenhouses.

From Tintin to the Smurfs, Europe's greatest graphic icons are celebrated in a grand Art Noveau gallery.

A little sculpture with a large wardrobe.

A shining memorial to a Belgian hero is said to bring luck to anyone who touches it.

An Italian vineyard invites religious pilgrims to stop by 24/7 to get their drink on, for free.

This beautiful 150-year-old synagogue survived Italy's fascist period and the Second World War.

One of the earliest depictions of an Arthurian scene that is shrouded in mystery.