For 2,600 years, Carcassonne has stood as Europe’s ultimate fortress. From Roman emergency walls to Saint Louis’s double ramparts, hidden water systems and lethal gate defenses, its builders turned stone into a military machine so formidable that even the Black Prince refused to attack. Blending archaeology and engineering, this film uncovers how innovation, strategy and restoration shaped an “impregnable” citadel that defied time itself.
