Notre Dame Cathedral, Laon, France Distant view Source: By Pline (Own work) [CC-BY-SA-3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons. http://commons.wikimedia.org/wiki/File%3ALa_cath%C3%A9drale_de_Laon_DSC_0707.jpg

Notre Dame Cathedral, Laon, France Principal (west) facade Source: By PMRMaeyaert (Own work) [CC-BY-SA-3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons. http://commons.wikimedia.org/wiki/File%3ALaon%2C_Cath%C3%A9drale_Notre-Dame_PM_14294.jpg

Notre Dame Cathedral, Laon, France Partial exterior view Source: Marek69 at en.wikipedia [CC-BY-SA-3.0 (http://creativecommons.org/licenses/by-sa/3.0) or GFDL (http://www.gnu.org/copyleft/fdl.html)], from Wikimedia Commons. http://commons.wikimedia.org/wiki/File%3ALaon_Cathedral.JPG

Notre Dame Cathedral, Laon, France West facade portals Source: By Tango7174 (Own work) [GFDL (http://www.gnu.org/copyleft/fdl.html) or CC-BY-SA-4.0-3.0-2.5-2.0-1.0 (http://creativecommons.org/licenses/by-sa/4.0-3.0-2.5-2.0-1.0)], via Wikimedia Commons. http://commons.wikimedia.org/wiki/File%3APicardie_Laon3_tango7174.jpg

Notre Dame Cathedral, Laon, France Nave in four tiers, with clerestories, triforium and tribune under sexpartite vaulting Source: "Interieur2 kathedraal Laon". Licensed under Creative Commons Attribution-Share Alike 3.0 via Wikimedia Commons - http://commons.wikimedia.org/wiki/File:Interieur2_kathedraal_Laon.JPG#mediaviewer/File:Interieur2_kathedraal_Laon.JPG

Notre Dame Cathedral, Laon, France Sexpartite vaulting in nave Source: By Aymeric pathier (Own work) [CC-BY-3.0 (http://creativecommons.org/licenses/by/3.0)], via Wikimedia Commons. http://commons.wikimedia.org/wiki/File%3AF02_Laon_Cath_ND_Tribune_triforium_Voute_nef_centraleP1390912.JPG

Notre Dame Cathedral, Laon, France Rose window Source: By Vassil (Own work) [Public domain], via Wikimedia Commons. http://commons.wikimedia.org/wiki/File%3ARose_Choeur_Cath%C3%A9drale_de_Laon_191008_4.jpg

Notre Dame Cathedral, Laon, France Plan Source: "Dehio 362 Laon Cathedrale". Licensed under Public domain via Wikimedia Commons - http://commons.wikimedia.org/wiki/File:Dehio_362_Laon_Cathedrale.jpg#mediaviewer/File:Dehio_362_Laon_Cathedrale.jpg. From Georg Dehio/Gustav von Bezold: Kirchliche Baukunst des Abendlandes. Stuttgart: Verlag der Cotta'schen Buchhandlung 1887-1901, Plate No. 362.