People visit an ice hotel in the Ice-Snow World in Harbin, capital of northeast China's Heilongjiang Province, Jan. 17, 2019. (Xinhua/Wang Song)

Photo taken on Jan. 17, 2019 shows an ice hotel in the Ice-Snow World in Harbin, capital of northeast China's Heilongjiang Province. (Xinhua/Wang Song)

Photo taken on Jan. 17, 2019 shows an ice hotel in the Ice-Snow World in Harbin, capital of northeast China's Heilongjiang Province. (Xinhua/Wang Song)

People visit an ice bar in the Ice-Snow World in Harbin, capital of northeast China's Heilongjiang Province, Jan. 17, 2019. (Xinhua/Wang Song)

People visit an ice bar in the Ice-Snow World in Harbin, capital of northeast China's Heilongjiang Province, Jan. 17, 2019. (Xinhua/Wang Song)

Visitors take selfies at an ice bar in the Ice-Snow World in Harbin, capital of northeast China's Heilongjiang Province, Jan. 17, 2019. (Xinhua/Wang Song)

A woman visits an ice hotel in the Ice-Snow World in Harbin, capital of northeast China's Heilongjiang Province, Jan. 17, 2019. (Xinhua/Wang Song)

People visit an ice bar in the Ice-Snow World in Harbin, capital of northeast China's Heilongjiang Province, Jan. 17, 2019. (Xinhua/Wang Song)

People visit an ice bar in the Ice-Snow World in Harbin, capital of northeast China's Heilongjiang Province, Jan. 17, 2019. (Xinhua/Wang Song)

A visitor takes pictures at an ice bar in the Ice-Snow World in Harbin, capital of northeast China's Heilongjiang Province, Jan. 17, 2019. (Xinhua/Wang Song)