The fantastic architectural models of a French traveler.

An ancient monastery, a locked room, and a mysterious book heist.

Historic medieval fortified city in southwest France.

Two small chapels housed inside an ancient tree.

Exquisite wall sculptures carved in secret by an early quarryman in an obscure corner of the Paris Catacombs.

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

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

A Gothic cathedral created from volcanic rocks.

This natural French spring has been turned into a magical grotto by Roman and medieval constructions.

The largest underground church in Europe.

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

This massive blockhead sculpture hides an entire library.

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

How did a French journalist’s grave become the sexiest statue in the cemetery?

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

Hundreds of hidden passageways weave through the old quarters of Lyon.

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

Sacked by Vikings, blessed by William the Conqueror, dealt a fatal blow during the French Revolution—these ruins have seen it all.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

One of the greatest maze designer’s greatest mazes.

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

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

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

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.