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Find more RMC Découverte documentaries on RMC BFM Play ▶ https://bit.ly/RMCDECOUVERTE In the heart of Paris, on the Île de la Cité, stood one of the most majestic palaces of the medieval era, the Palais des Rois. Built at the beginning of the Middle Ages, only two vestiges of this grandiose palace remain: the Sainte-Chapelle, the largest and most audacious palatial chapel of the time, and the Conciergerie, a medieval room of impressive dimensions, known for having served as a prison. These two unique places demonstrate an exceptional mastery of construction techniques: ribbed vaults, innovative consolidation system, iron frame, load-bearing pillars of impressive diameter... They allow these two buildings to cross the centuries and bear witness to the magnificence of the Palais de la Cité. But how did they manage to build on damp and unstable ground? How can we maintain the impressive surface area of stained glass windows in the Sainte-Chapelle? How can we ensure the stability of the Salle des Gens-d'armes in the Conciergerie, which could accommodate up to 2,000 people? Thanks to sometimes imperceptible details, archaeologists, architects and historians reveal the construction techniques that would make the Sainte-Chapelle and the Conciergerie the most accomplished buildings of the Middle Ages. #Paris #Conciergerie #Documentary #Heritage #France