An abandoned beach resort in Normandy reclaimed by artists.

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

Museum in a swimming pool where the water still flows.

A public park off the beaten path with a beautiful waterfall and 13th century Cistercian abbey.

These quaint French houses dangle precariously over a precipice.

Beautiful carved tunnels.

A charming flea market shop dedicated to retrofuturistic apparati.

Sleep in a climate-controlled plastic bubble for the night.

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

This modern French ossuary contains the jumbled bones of 130,000 WWI soldiers.

An icy lake tucked among jaw-dropping alpine panoramas.

The mental institution where Van Gogh created some of his most famous work now allows guests to walk in the artist's footsteps.

Historic medieval fortified city in southwest France.

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.

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

A subterranean shelter remains intact under a busy Paris railway station.

The curious underground history of keeping Paris clean.

One of the greatest maze designer’s greatest mazes.

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

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

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

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

One of the oldest medical collections in Europe focusing on rare surgical instruments.