something particularly long and difficult to achieve. It also meant that the building presents a complex pattern of French religious types of architecture from the 13th century to the 16th. In 1787, responding to Vatican doctrines calling for making interiors of churches more open and welcoming, the jubé, or choir screen, which separated the choir from the nave, was removed. In 1793, during the French Revolution, the Jacobins smashed the statues on the church portal. The church was nationalised and transformed into a Temple of Reason, until the reign of Napoleon I. In 1848, portions of the cathedral, including the portal sculpture, were restored. A major restoration of the cathedral began in 1993. The organ restoration was completed in 1996, and began of the upper windows, Between 2010 and 2013 the restoration of the north transept and is rose window was completed, restored, and two hundred square meters of new windows, dedicated to Saint Martin, were added to cathedral. A new main altar was dedicated in 2018. Architecture The Exterior - West Front The west front of the cathedral displays three very different styles of architecture harmoniously combined. The lower walls of the towers and the central block of the facade up to the triangular fronton date were built in sober Romanesque style, then, along with the buttresses, were covered with much more ornate and dense Flamboyant decoration. Transepts and chevet The sides of the cathedral are reinforced with massive flying buttresses, capped with spires to give them additional weight. The chevet of the cathedral, at the east end, is very unusual along Gothic cathedrals in not having any other structures attached to it. The north transept of the cathedral is unusual in that it has two additional buttresses to support the north front, with its rose window. The rose window also has an unusual bar attached to its face to give it additional strength. Towers The two towers have heights of 69 and 70 meters. Portions of the bases of the towers date to the 12th century, The faces of the towers are covered with very elaborate tracery and decoration in the later Flamboyant style. The top sections of the two towers, which completed the structures, with heights of 69 and 70 meters, are early examples of French Renaissance architecture. Interior The nave has the traditional three levels; a gallery on the ground floor with large pillars supporting the