Bordered by forest on three sides and the ocean on the other, the Great Dune of Pilat is the highest sand dune in Europe.

A crumbling island fortress that seems to be covered in a field of stone crosses but is simply incomplete.

The haunting concrete remains of a Nazi pebble crusher can still be found in this small French commune.

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

The man who introduced reinforced concrete to the world demonstrated its genius by using it to build his own house.

A 16th-century fountain marks the site of a lost medieval cemetery once filled with mass graves.

Legend has it this 11th-century castle was paid a visit from the devil.

French Time Capsule-19th Century home revealed to the public.

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

To the famous surrealist artist, liberty required two torches held high.

The Argonaute submarine was the French navy's pride and joy in the 1950's.

An isolated 17th-century chapel on a remarkable site once dedicated to Celtic sun worship.

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

The 16th-century church was kept in its ruined state as a reminder of the casualties of World War I.

Underneath a chalk hill in France lies what Hitler hoped would be the underground launching base for a devastating new weapon.

Figures of unknown origin carved into the surfaces of underground caves.

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

An abandoned beach resort in Normandy reclaimed by artists.

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

Bits of architecture from a town destroyed in World War I now decorate this hotel garden.

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

The remains of 40,000 humans, meticulously stacked in a tiny churchyard shed.

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

Hundreds of dwarf beeches create an unusual, haunting forest in the north of France.