 They are the Ruiguang Pagoda, the earliest pagoda in Suzhou built in 247, the Wu Gate Bridge, the entrance to the gate at that time over the water passage and the highest bridge in Suzhou at the time, and Pan Gate.The Ruigang Pagoda is constructed of brick with wooden platforms and has simple Buddhist carvings at its base.Pan Gate is part of the ancient city wall built in 514 BCE that surrounded and protected Suzhou.