A climber climbs on a rock wall covered with ice at Sandstone Ice Park in Sandstone, Minnesota, the United States, on Feb. 18, 2017. (Xinhua/Shen Ting)
A climber climbs on a rock wall covered with ice at Sandstone Ice Park in Sandstone, Minnesota, the United States, on Feb. 18, 2017. (Xinhua/Shen Ting)