This army of concretions is an unexplained geological phenomenon unlike anything else in the world.

A beautiful lighthouse with as many steps as days in the year, as many windows as weeks, and as many levels as months.

Small French town or alien garage?

The Nobel-Prize-winning author of The Stranger is buried beneath a simple gravestone in a sleepy French village.

Remains of the artificial harbours invented for the Allied invasion of Normandy can still be seen at sea.

Abandoned blockhouses from Nazi Germany's Atlantic Wall erode into the sea on a French beach.

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

One of the great treasures of Neolithic art lies within this carefully constructed pile of rocks.

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 small town hallucinates en masse - Bad bread, or CIA science project?

The sunken structure looks like the victim of a catastrophic flood.

Jean Tinguely's bizarre monster sculpture is hidden deep in a forest.

One of the largest ochre quarries in the world, hidden in a limestone landscape.

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

The Sun King's military models, saved from the Louvre.

Since ancient times these picturesque springs have been providing bathers with healing waters.

A chapel on a volcanic core, marking the end of a successful journey.

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

The world's tallest bridge is also possibly the most elegant.

A natural arch carved by a river gave its name to the so-called "Cave of Forgotten Dreams."

This stunning natural double arch, the largest in the Alps, went undiscovered until 2005.

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

The fantastic architectural models of a French traveler.

Two small chapels housed inside an ancient tree.