135 bronze medallions mark a French meridian line which once rivaled the hotshot Greenwich timeline.

Hundreds of prehistoric stones, arranged in perfect lines in a French field.

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

Historic medieval fortified city in southwest France.

An overlooked marble is the only surviving in-place 18th century example of the measurement that changed how we define distance.

The famous winding walk at Chartres is surrounded in mystery and myth.

Beneath the city of Lourdes, France is a massive, concrete church.

A 14th century bridge built as a fortress, where the devil lurks on one of its towers.

Where the high court feasted, frolicked, and high courtesans put their royal lovers' diamonds to the test.

A beautiful and classically designed villa, with an hourly infestation of monsters.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

Science fiction's grandfather has a fittingly marvelous tomb.

The oldest stone house in Paris was built by its most famous alchemist.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

The alleged house of the Virgin Mary is tucked away in a park and nature preserve on Mt. Koressos in Turkey and is holy to both Catholics and Muslims alike.

An extensive collection of reliquaries containing the bones of saints housed in the largest Catholic church in Venice.

No one knows who created the statues or if they are arranged properly—let alone the artwork's real name.

One man's lifetime collection of tiny objects of wisdom gathered from around the world, on display for public enjoyment.

South Korea's love of the silly photograph is on full display at this goofy collection of trompe l'oeil paintings.

The world's first cruise ship-shaped hotel is perched atop a cliff.

Where the Great Wall of China meets the sea.

Just below the surface, shrimp are producing temperatures hotter than the sun.

A wunderkammer of gold and silver reliquaries and ancient saintly bones.

The mummified relics of an American missionary.