Now a memorial, this factory was once used as a concentration camp for artists by the Vichy government.

Half a century after it was abandoned, this ghost town is coming back to life.

A total of 22 tiny bridges cross this canal of the Yvette River, forming a unique trail.

Thousands of flamingos and other bird species flourish in these Camargue wetlands.

A castle-like sea fort from the 17th century is now a museum to oyster farming.

Longest canal tunnel in the world, abandoned in the 1960s.

Walk through living pictures and music in the Cathedral of Images.

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

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

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

What looks like a normal building is really a hollow facade hiding a subway vent.

A museum which takes visitors to the côté obscure of Paris.

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

Old vessels have been transformed into artistic canvases in this unusual cemetery.

A 2017 crowdfunding campaign saved this historic castle from being destroyed.

Fighting the British and making game shows for over 150 years.

Site of one of World War I's most horrific scenes.

An underground city of ancient quarry tunnels hid thousands of Allied soldiers in WWI.

This hidden garden boasts amazing views of Lyon.

Natural mummies hidden in the crypt of a medieval French church.

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

A daring D-Day assault by U.S. Army Rangers is commemorated atop the high cliffs of this strategic point.

A unique zoological park home to over 30 species of wild cats, both big and small.

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