QIanmen, literally means the front door, because it's located in the front of the Forbidden City. The old Qianmen zone was one of the poorest parts also the most complicated part of Beijing. There once lived the poorest people, the small vendors and the hookers. Also there were many old famous brands like silk brand 'Ruifuxiang', and the shoe brand "Buyingzhai". Now it has been rebuilt according its original look, you can go to visit the typical Hutong and taste the traditional Beijing snacks.
Qianmen have also now (since 2008) a beautiful commercial street. You should have a walk and eat Beijing Duck at the old and famous restaurant located there.