Tourists admire a “Buddha's Light” amid a sea of clouds as the sun sets at Aoyu Peak, more than 1,700 meters above sea level at Huangshan Mountain in East China’s Anhui Province on August 23, 2017. The optical phenomenon is caused by sunlight refracting off water droplets into rainbow-like, concentric rings. The phenomenon has been visible at the site in recent days. Photos: VCG