People visit ice sculptures illuminated by colored lights during a trial operation ahead of the Harbin International Ice and Snow Festival in the northern city of Harbin, China, Jan. 4, 2015. The winter festival will be officially opened on Jan. 5, 2015.

People tour between the large-scale ice sculpture castle at the Ice and Snow World in Harbin city, China, Jan. 5, 2015. The 31st Harbin International Ice and Snow Festival kicks off on Jan. 5 and will last for three months.

Visitors take photographs on an ice sculpture during the Harbin International Ice and Snow Festival in Harbin, China, Jan. 5, 2015.

People walk in a wheel on ice while visiting the Zhaolin Park, Jan. 6, 2015, during the Harbin International Ice and Snow Festival in Harbin, China. The festival draws tens of thousands of visitors each year to its enormous ice buildings and sculptures.

A woman rides horse-shaped ice sculpture during the opening day of the Harbin International Ice and Snow Festival in the city of Harbin, China, Jan. 5, 2015. The annual Ice and Snow Festival, organized by China National Tourism Administration and local governments kicked off in Harbin, one of the coldest cities in China.

People ride slides on ice sculptures illuminated by colored lights during the opening day of the Harbin International Ice and Snow Festival in the northern city of Harbin, China, Jan. 5, 2015.

People tour between the large-scale ice sculpture castle at the Ice and Snow World in Harbin city, China, Jan. 5, 2015. The 31st Harbin International Ice and Snow Festival kicks off on Jan. 5 and will last for three months.

Visitors look around ice sculptures ahead of the Harbin International Ice and Snow Festival in the northern city of Harbin, China, Jan. 4, 2015.

Visitors makes their way through a maze which is made by ice bricks and snow ahead of the Harbin International Ice and Snow Festival in the northern city of Harbin, China, Jan. 4, 2015.