Tourists watch a movie in the 4D media hall in the City of Flowers, a gardening complex in Kunming, capital of southwest China's Yunnan Province, Dec. 22, 2019. The City of Flowers, a large-scale gardening complex in Kunming, includes a floral greenhouse, an experimental museum and a 4D media hall in over 60,000 square meters. (Xinhua/Hu Chao)