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

Trek up this glacier before it disappears.

Tables of secondhand books fill the inner courtyard of this 17th-century stock exchange.

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

For those late-night mollusk cravings.

Walk through spectacular aisles of hanging meat and wagon wheel–sized cheese at the world's largest wholesale food market.

15,000 year old bison sculptures.

Folklore and history carved into Brittany's coast.

Exquisite examples prehistoric bas-relief carvings.

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

Artist's eccentric property excessively decorated with found objects and work of his own.

Artist Danielle Jacqui decorates nearly every inch of her home inside and out with her work.

French commune at the heart of conspiracies.

100-windowed castle turned art gallery, built by one dedicated mason.

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

An ancient ossuary in Rouen.

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

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

This ancient theater was once the home of fierce gladiatorial battles.

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

One of the world's most complex timepieces.

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

A French valley with forests so lush it was nicknamed "the Small Amazonia of the Pyrenees."

An abandoned beach resort in Normandy reclaimed by artists.