Nanjing has some of the oldest and finest museums in China. Nanjing Museum, formerly known as National Central Museum during ROC period, is the first modern museum and remains as one of the leading museums in China having 400,000 items in its permanent collection,. The museum is notable for enormous collections of Ming and Qing imperial porcelain, which is among the largest in the world. Other museums include the City Museum of Nanjing in the Chaotian Palace, the Oriental Metropolitan Museum, the China Modern History Museum in the Presidential Palace, the Nanjing Massacre Memorial Hall, the Taiping Kingdom History Museum, Jiangning Imperial Silk Manufacturing Museum, Nanjing Yunjin Museum, Nanjing City Wall Cultural Museum, Nanjing Customs Museum in Ganxi House, Nanjing Astronomical History Museum, Nanjing Paleontological Museum, Nanjing Geological Museum, Nanjing Riverstones Museum, and other museums and memorials such Zheng He Memorial, Jinling Four Modern Calligraphers Memorial.