Visitors watch closely at the pictures at the Zhol City prison site at the foot of the Potala Palace. [Xinhua Photo]
![Visitors watch closely at the pictures at the Zhol City prison site at the foot of the Potala Palace. [Xinhua Photo]](http://images.china.cn/attachement/jpg/site1007/20090325/001109b42f730b33cc3136.jpg "Visitors watch closely at the pictures at the Zhol City prison site at the foot of the Potala Palace. [Xinhua Photo]")