Tianjin Weisanzongbao, Drum Tower, Battery, Bell Pavilion. In the two years of Yongle in Ming Dynasty (1404 AD, the Drum Tower in Tianjin is still the same year), Tianjin was built as a Weizhu City. At that time, it was only a Tuweizi. It took about 90 years to build a brick city in Hongzhi for six or seven years (1493 - 1494). Four towers with east, west, South and north gates and four corners were built. The Drum Tower in the center of the city was also built at this time. That is between 488 and 489. Named Drum Tower, it is really Bell Tower.