Like something from a Mary Shelley novel, the abbey that crowns the promontory of Saint Mathieu, remains in the dark while a lighthouse 20 meters high ,lights it up, it again and again during the night. Flashes of light on a white and blue wall. Years in the depths of the ocean without moving. Some ruins that recall the area's past, while looking to the future. A building, while about to disappear continues to be reclaimed as a tourist attraction in the area. Legend has it that when moving the body of the apostle Matthew, some merchants from Leon were miraculously saved from being shipwrecked on the promontory. In the sixth century, to house the relics of the saint, the first monastery founded by Tanguy. This abbey retains the original Roman facade, the stone vaults of the choir and the arches of the nave. During the twilight is exceptional because it receives light from the lighthouse and ethis reveals it in all its beauty.