Aerial photo taken on Aug. 1, 2019 shows the tidal flat wetland along the Songhua River running through Harbin, capital of northeast China's Heilongjiang Province. Attracted by the coolness in summer, many tourists come to Harbin for vacation. Meanwhile, Harbin is a city of music for the locals who got in touch with European classical music in an earlier time in China. With the cool summer and rich culture, Harbin received 36.23 million tourists and made revenue of 60.7 billion yuan (8.6 billion U.S. dollars) in the summer of 2018. (Xinhua/Wang Jianwei)