First mountain tunnel elevators in the world put into use (1/3)

People take the elevators at the Tianmenshan Mountain tourist tunnel in Zhangjiajie National Forest Park of central China's Hunan Province on Dec. 28, 2013. The elevators, with a length of 692 meters, are the first in the world in a mountain tunnel and expected to transport 72,000 tourists every day. [Photo/IC]