Panorama of the fortified city of Carcassonne (Aude, France) and the Pont Vieux crossing the Aude River. The fortress of Carcassonne was considered impregnable and never conquered. It was begun by the Romans and built up through the years. It fell into disrepair was restored in the 19th century. It is now a UNESCO World Heritage Site.
Photo credit: Jean-Pierre Lavoie
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