Part modern art project, part traditional chapel, this see-through church is only substantial from the right angle.

Each spring, a dreamlike carpet of bluebells overtakes the forest floor.

This former Masonic lodge has been transformed into part museum, part bar, all awesome.

One woman's decades-long obsession with the "La Fée Verte."

The spiral staircase hidden inside this giant Parisian column was likely built for Catherine de Medici's astrologer.

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

A medieval military street hidden beneath a charming French fishing village.

This professional clown's home is an outsider art wonderland.

This is what trains will look like after the zombie apocalypse.

Do these monsters look familiar? The gargoyles on this church are all from pop culture.

Science fiction's grandfather has a fittingly marvelous tomb.

This historic island prison holds one of the dungeons from the Count of Monte Cristo even though it is a work of fiction.

Ancient paintings known as the "Sistine Chapel of Cave Art."

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

One of the greatest maze designer’s greatest mazes.

In the best of all possible worlds, everyone will get a chance to see this statue in which Voltaire's heart is interred.

The history of radiation is on safe display at the foot of a radiation science laboratory.

This French ghost town from World War II has been left as a memorial to German atrocities during World War II.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

"In the Dark" Restaurant in Paris offers dinner in complete darkness.

Indents in the pavement are all that remain from a grisly death machine in Paris.

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

Walk upon the mementos of the dead in this Parisian courtyard paved with medieval tombstones.

A mechanized clock where a man fights off a dragon, crab, and rooster.