A visit to the 112m-high Clocher Neuf, also known as the Tour Nord (North Tower), is worth the ticket price and the climb up the long spiral stairway (350 steps). Access is just behind the cathedral bookshop. A 70m-high platform on the lacy flamboyant Gothic spire, built from 1507 to 1513 by Jehan de Beauce after an earlier wooden spire burned down, affords superb views of the three-tiered flying buttresses and the 19th-century copper roof, turned green by verdigris.
