PL-CITY WALL-XIAN-CHINA-A section of the City Wall of the Ming Dynasty (1368 - 1644), which s the largest and most intact Ming Dynasty castle in the world. Xian is the capital of Shaanxi province, located in the southern part of the Guanzhong Plain and is the venue for the 3rd leg of the UIM F1 Powerboat World Championship series for 2007. Picture by Paul Lakatos/Idea Marketing.