partie 1:
http://www.dailymotion.com/video/xb06zb_la-grande-muraille-de-chine-13_tech
partie 2:
http://www.dailymotion.com/video/xb07kq_la-grande-muraille-de-chine-23_tech
partie 3:
http://www.dailymotion.com/video/xb08un_la-grande-muraille-de-chine-33_tech
