Introduction to the back garden: The Confucius Mansion Garden is located in the backyard of the Confucius Mansion, also known as Tieshan Garden. In fact, there is no iron mountain in Iron Mountain Garden. There are only a few pieces of iron ore shaped like peaks in the northwest corner of the garden. This stone was moved in by Kong Qingrong when he was renovating the garden during the Jiaqing period of the Qing Dynasty. He said that the third ring road from heaven came to help him build the garden. From then on, he also called himself the "Master of Tieshan Garden".