Introduction to Ganxi Residence: Ganxi Residence, also known as Ganxi’s former residence or Gan family compound, was built in the Jiaqing period of the Qing Dynasty and is commonly known as "Ninety-nine and a Half Rooms". It is also known as the Ming Xiaoling Mausoleum and the Ming City Wall. The three major landscapes of Nanjing during the Ming and Qing Dynasties have extremely high historical, scientific and tourism value. They are the largest and best-preserved private residences in Nanjing.