A Chengdu Metro train with an interior featuring the Huanglong Scenic and Historic Interest Area is seen in Chengdu city, Sichuan province, Sept 9, 2019. Huanglong, a UNESCO World Heritage site, is home to snow-capped peaks and the easternmost Chinese glacier. In addition to its mountain landscape, diverse forest ecosystems can be found, as well as spectacular limestone formations, waterfalls and hot springs. [Photo/China News Service]