Aerial photo taken on Jan. 16, 2019 shows the construction site of the International Horticultural Exhibition 2019 Beijing China (commonly known as Expo 2019 Beijing) in Yanqing District of Beijing, capital of China. Saturday marks the 100 days countdown to the Expo 2019 Beijing, which is slated to open on April 29, 2019 in Yanqing District. Construction is going well with all infrastructure for the 100 indoor and outdoor gardens at the exhibition. (Xinhua/Zhang Chenlin)