Introduction to the protected block: Zhenhai Gate is a two-story bell tower-style building with green bricks and four doors. The lintel is written "Zhenhai Gate" and the pavilion is written "Daxiang Terrace". According to reports, during the Song Dynasty, seawater poured back in. Fan Zhongyan was appointed magistrate of Xinghua County. In order to block the seawater, he built a weir and Zhenhaimen here, which meant that the seawater would no longer invade. The origin of the big incense platform directly above is that there was a plague in the 35th year of the Republic of China, and countless people died. The big incense platform was built to pray for relief from the disaster. Now the two are rebuilt and merged into one to continue the history.