Introduction to Yimen: When you enter the south gate, you will see Yimen. On the south side of Yimen, there are four words "miraculous traces of ancient cities" engraved on it. On the north side of Yimen, there are four characters "Yiwen Garden Site" engraved on it. It is said that in order to build this garden, one penny was collected from every resident in the city, so it was called "One Garden".