Monks light up butter lamps during the Butter Lamp Festival in the Jokhang Temple in Lhasa, Southwest China's Tibet autonomous region on Dec 16, 2014. The festival, which falls on the 25th day of the 10th month of the Tibetan calendar every year, is in honor of nirvana or the enlightenment day of Je Tsongkhapa, the founder of the Gelukpa school of Tibetan Buddhism. [Photo/CNS]