US first lady Michell Obama (C) visits the Museum of Qin Terracotta Warriors and Horses in Xi'an, Shaanxi province, with her daughters Sasha (R) and Malia (R2), on March 24, 2014. The Terracotta Army was listed as a UNESCO World Heritage Site in 1987. She will visit the City Wall of Xi'an later today. [Photo/Asianewsphoto]