Nanjing, located in Jiangsu Province of China, is a city with a profound historical heritage and a wealth of cultural treasures. It served as the capital of several Chinese dynasties and regimes, including the Eastern Wu during the Three Kingdoms period, the Southern Tang during the Five Dynasties and Ten Kingdoms period, as well as the Ming dynasty before the capital was relocated to Beijing. The city is also significant for being the capital of the Republic of China prior to the establishment of the People's Republic in 1949. Prominent historical sites include the Sun Yat-sen Mausoleum, honoring the founding father of modern China, and the Ming Xiaoling Mausoleum. Nanjing is also remembered for the tragic Nanjing Massacre in 1937. Modern-day Nanjing is a bustling metropolis featuring historical heritage alongside rapid urban development. It's home to numerous educational institutions, including Nanjing University, and is a hub for research and development, particularly in the fields of electronics, cars, iron, and steel.