 Complete the following phrase:  In later periods of Gothic, pointed needle-like spires were often added to the towers, giving them much greater height. A variation of the spire was the flèche, a slender, spear-like spire, which was usually placed on the transept where it crossed the nave. They were often made of wood covered with lead or other metal. They sometimes had open frames, and were decorated with sculpture. Amiens Cathedral has a flèche. The most famous example was that of Notre-Dame de Paris. The original flèche of Notre-Dame was built on the crossing of the transept in the middle of the 13th century, and housed five bells. It was removed in 1786 during a program to modernise the cathedral, but was put back in a new form designed by Eugène Viollet-le-Duc. The new flèche, of wood covered with lead, was decorated with statues of the Apostles; the figure of St Thomas resembled Viollet-le-Duc. The flèche was destroyed in the 