Hundreds of actors dressed as ancient "terracotta warriors" perform along a street on April 10, 2010 in Shanghai to promote tourism of Northwest China's Shaanxi Province ahead of the Shanghai World Expo. The terracotta warriors and horses were discovered in 1974 in the Mausoleum of Qinshihuang, the first emperor of the Qin dynasty who unified China in today's Shaanxi Province in 221 BC. Shaanxi, well-known for the terra-cotta warriors of Qin Dynasty (221 BC-206 BC), sees the coming World Expo as a good chance to promote the local tourist resources. Photo: Xinhua