Introduction to Xuanwu Gate: Xuanwu Gate was built in the first year of Xuantong of the Qing Dynasty (1909). It was opened to facilitate guests of the "Nanyang Encouragement Association" to visit Xuanwu Lake. It marks that Xuanwu Lake has officially become a "park" in the modern sense. The name of the gate "Xuanwu Gate" was written by Mr. Cai Yuanpei in 1928. It is now the most important one among the five gates of Xuanwu Lake.