As its name suggests, the Merveille building is the abbey's undisputed masterpiece. Its construction gets back to the beginning of the 13th century and represents a technical and artistic feat. It is difficult to imagine how such a building could have been erected on a rock of barely 4 km2 and 960m in circumference. I300 years of history contemplate us. The citadel has confirmed, over time and constructions, that it belongs forever to the hearts of the French.