Introduction to the Walled Castle: In addition to the lake, the scenic spot is centered on two Song Dynasty Walled Castles. It is said that Tiewei Village was the place where Mongolian Khan Mengge (the grandson of Genghis Khan) personally led an army of 100,000 to attack Hechuan Diaoyu City in February 1259. To commemorate this battle, later generations built iron walls and copper walls that were impregnable. The meaning of conquering.