A 999-step staircase leading to the 130-metre-tall Tianmen Cave lit up in southern China. The stunning video, filmed in the city of Zhangjiajie in Hunan Province on May 29, shows a long staircase to Tianmen Cave illuminated by colourful lights. The 131.5-metre-high, 57-metre-wide and 60-metre-deep Tianmen Cave, is a natural karst cave through mountains. According to a worker, the lights can not only light the route for travellers at night but also beautify the stairs. The video was provided by local media with permission.