Amiens Cathedral: Construction Sequence

Click the button lower right hand corner of screen to view accompanying subtitles. Update: Feburary 28, 2018. It has come to my attention that there is an error in the construction sequence. As shown, the western clerestory level of the north and south transept was built AFTER the aisle-level of the choir and apse. In fact, the transept clerestory was built SIMULTANEOUS to the choir and apse. YouTube does not allow me to re-upload a video, so I am sharing the link to the revised and corrected sequence here