Introduction to Hongwu Tongbao: There is a huge imitation model of "The First Coin of the Ming Dynasty - Hongwu Tongbao" not far from the main hall of the Mingzu Mausoleum. This model of Hongwu Tongbao has a diameter of 998 meters and an area of ​​about 80 square meters. It is the largest coin model of Hongwu Tongbao in the country.