These medieval ruins have survived since the 12th century, even providing shelter from the Nazis.

Series of underground houses inhabited continuously for centuries.

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

Stripes of human ashes cover a back lawn in the most sought-after burial grounds in Paris.

This narrow path was cut right into a French mountainside to feed the country's early naval expansion.

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

Green labyrinth formed by a karstic maze hidden in a preserved oak forest.

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.

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

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

If they push on just the right spot, even the weakest person can move this titanic boulder.

Statue of a decomposing prince that once held his heart in its hand.

A centuries-old complex of hand-dug stone chambers has sheltered locals in times of trouble.

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

This medieval tower is all that remains of the castle where Joan of Arc was held before being burned at the stake.

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

A tiled, multi-level garden of survival in Lyon.

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

Hundreds of prehistoric stones, arranged in perfect lines in a French field.

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

Ivy-covered Medieval tunnels cut through this charming town in France's Loire Valley.

A medieval church with largest and oldest collection of Renaissance frescoes in France.

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