This otherworldly French waterfall looks like its waters have turned to stone.

The historic Masonic Lodge in which the first-ever female Mason was initiated.

Located in the house where Gustave Flaubert was born, this odd museum has more to do with medical grotesquery than the Western novel.

Perhaps the most beautiful of preserved saints, with a little help from Paris.

One of the world's most complex timepieces.

The construction of a tram line unveiled hidden remnants of the old medieval city.

Miles of man-made caves and tunnels are currently used for cultivating mushrooms.

Trek into the depths of the cave where 17,000-year-old paintings exist alongside 400-year-old graffiti.

A French library that makes sure its love of books is writ large... giant in fact.

This crumbling, graffiti-covered mansion sits tantalizingly within reach of the proletariat who frequent a public park.

A unique underground structure dating back to the 1st century BC.

A colossal sculptural lion built by the same man who designed the Statue of Liberty.

Nicknamed the "Museum of Horrors," this French anatomical collection has been fascinating visitors for over a century.

The remaining relics of the patroness of Paris lie in a chapel under a striking double spiral staircase.

This submersible road connecting a French island to the mainland is lined with safety towers for when the tide strands travelers.

A 400-year-old church covered floor to ceiling in ex-voto offerings from the faithful.

This Parisian gem is one of the most incredible ethnographic museums in the world.

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

A quaint medieval millhouse hovers surprisingly above the waters of the Seine.

An art world insider finds himself battling for his artistic home.

A magical, macabre wax museum, beloved by locals, uses real artifacts to depict an assassination from the French Revolution.

The Church of the Annunciation was carved into the face of a cliff, just like the rest of the town of Haute-Isle.

Collection of antique taxidermy and natural specimens, near one of Paris's oldest flea markets.

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