The name, which means the Marvel, refers to all the buildings built on the north face of the mount between 1211 and 1228, to house monks, pilgrims and distinguished guests. From the outside, the buildings resemble a fortress. The interior is a fine example of the evolution of the Gothic style, from a simplicity which is almost Romanesque in the lower halls, to the refinement of the cloisters, via the elegance of the Guests' Hall, the grandeur of the Knights' Hall and the mysterious luminosity of the Refectory.