Introduction to Lang Guan's Residence: Lang Guan's Residence is located on the west side of the main street. It is one of the two existing Lang Guan's Residences. The facade of this Langguan residence is simple, but the brick-carved windows are extremely exquisite and have profound meaning. The window lattice is made of finely carved blue bricks, and four things, namely piano, chess, calligraphy and painting, are engraved on it, which fully demonstrates the artistic taste of the owner of the house, Du Linguang, a calligrapher during the Guangxu period of the Qing Dynasty.