Built on steep mountainsides, getting around Wushan County in southwest China's Chongqing has never been easy. To meet residents' needs, the county constructed the world's longest outdoor escalator, stretching about 905 meters. Climbing slopes with an average gradient of 40 degrees, where machinery struggled to operate, large amounts of materials were carried up step by step by workers to make it possible. Put into trial operation this February, it has already become a vital part of the city's transport system.