Hot air balloons are seen during the 2017 International Balloon Festival in Leon city, Guanajuato state, Mexico, on Nov. 17, 2017. The 2017 International Balloon Festival kicked off on Friday in Leon city. About 200 hot air balloons with different shapes and colors participated in the event which is held from Nov. 17 to Nov. 20. (Xinhua/Francisco Canedo)