Follow the trail of the abandoned Gandrange steelworks or the decommissioned Uckange blast furnaces in Lorraine, a spectacular marine graveyard in Brittany's Crozon peninsula, a forgotten chateau on the outskirts of Paris, a derelict sanatorium in the Alps, the remains of a magnificent Art Deco concert hall in the north, a disused hospital in the south-west, a military fort in the Pyrenees, now off-limits, a former wine storage cellar in Normandy...