The evolution of the old city of Hanoi, Vietnam, shows that the city wall of Hanoi has been rebuilt. The city wall is divided into the inner city and the outer city, namely Luocheng and Zicheng (Hanoi was also called Luocheng and Zicheng in the early days). The latest city wall has a distinct European style. Sanshiliuhang Street is a commercial street formed outside the city wall. Thang Long Imperial Citadel is in the Zicheng and is already a world cultural heritage.