Nanjing has a history of more than 6,000 years of civilization, nearly 2,600 years of city building and nearly 500 years of capital building. It is one of the four ancient capitals in China, known as "the ancient capital of six dynasties" and "the metropolis of ten dynasties", and is an important birthplace of Chinese civilization. Blessed by China several times in history, it has long been the political and cultural center of southern China, with rich cultural heritage.