An extraordinary window on to the heart of cosmopolitan Shanghai over a hundred years ago - a true melting pot of cultures. Today the city's main shopping hub, Nanjing Road is here bustling with crowds of Chinese and Europeans and patrolled by Sikhs who made up an important part of the international police force. It is the only known surviving example of the film reportage shot by British war correspondent Joe Rosenthal during his coverage of the Boxer Rebellion in China between 1900 and 1901.