People enjoy the illuminations at the 27th Festival of Lights in Riverside, California, the United States, on Dec. 29, 2019. (Xinhua/Li Ying)

People enjoy the illuminations at the 27th Festival of Lights in Riverside, California, the United States, on Dec. 29, 2019. (Xinhua/Li Ying)

People enjoy a horse carriage ride during the 27th Festival of Lights in Riverside, California, the United States, on Dec. 29, 2019. (Xinhua/Li Ying)

People enjoy the illuminations at the 27th Festival of Lights in Riverside, California, the United States, on Dec. 29, 2019. (Xinhua/Li Ying)

A man takes photos at the 27th Festival of Lights in Riverside, California, the United States, on Dec. 29, 2019. (Xinhua/Li Ying)

People enjoy the illuminations at the 27th Festival of Lights in Riverside, California, the United States, on Dec. 29, 2019. (Xinhua/Li Ying)

People enjoy a horse carriage ride during the 27th Festival of Lights in Riverside, California, the United States, on Dec. 29, 2019. (Xinhua/Li Ying)

Photo taken on Dec. 29, 2019 shows the illuminations of the 27th Festival of Lights in Riverside, California, the United States. (Xinhua/Li Ying)

Photo taken on Dec. 29, 2019 shows the illuminations of the 27th Festival of Lights in Riverside, California, the United States. (Xinhua/Li Ying)

People pose for photos at the 27th Festival of Lights in Riverside, California, the United States, on Dec. 29, 2019. (Xinhua/Li Ying)

Photo taken on Dec. 29, 2019 shows the illuminations of the 27th Festival of Lights in Riverside, California, the United States. (Xinhua/Li Ying)

Photo taken on Dec. 29, 2019 shows the illuminations of the 27th Festival of Lights in Riverside, California, the United States. (Xinhua/Li Ying)

Photo taken on Dec. 29, 2019 shows the illuminations of the 27th Festival of Lights in Riverside, California, the United States. (Xinhua/Li Ying)

People pose for photos at the 27th Festival of Lights in Riverside, California, the United States, on Dec. 29, 2019. (Xinhua/Li Ying)