Limestone grottoes turns everyday objects into stone.

For a brief time in 1960s France, families could climb into a tiny submarine and be pulled along an underwater journey.

A sublime medieval path adorns the marble floor of one of the most beautiful Gothic cathedrals in France.

This triumphal arch celebrating the Sun King's conquest of Lille is a masterpiece of military architecture.

Exquisite examples prehistoric bas-relief carvings.

A huge Megalithic chamber tomb located behind a cafe.

15,000 year old bison sculptures.

This tiny hotel perched atop a 50-foot tower really puts things into perspective.

Tens of thousands of ancient rock carvings hidden in the heart of a French national park.

From carts to cars, this leftover Roman bridge in France has managed to survive for centuries.

The birthplace of the ferocious William the Conqueror, this castle is awash in medieval history.

The opulent home that inspired Tintin's Marlinspike Hall and the adventures within.

The world's most famous cheese caves.

This modern museum of Mediterranean culture is surrounded by a surreal concrete honeycomb.

Series of underground houses inhabited continuously for centuries.

Despite centuries of architectural innovation, this French castle is being built like it's the 13th century.

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

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

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

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

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

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

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

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