Visitors watch fireworks explode over ice sculptures during the official opening of the 29th Harbin International Ice and Snow Festival in Harbin in northeast China's Heilongjiang. — AP Photo

Visitors walk through ice sculptures during the official opening of the 29th Harbin International Ice and Snow Festival in Harbin in northeast China's Heilongjiang province. — AP Photo

Fireworks explode over ice sculptures during the official opening of the 29th Harbin International Ice and Snow Festival in Harbin. — AP Photo

Visitors view ice sculptures during the official opening of the 29th Harbin International Ice and Snow Festival in Harbin. — AP Photo

Fireworks explode over ice sculptures during the official opening of the 29th Harbin International Ice and Snow Festival in Harbin. — AP Photo

This picture taken on January 5, 2013 shows people visiting Ice and Snow World at the opening ceremony of the 2013 Harbin Internatoinal Ice and Snow Festival. — AFP Photo

This picture taken on January 5, 2013 shows people visiting Ice and Snow World as fireworks fill the sky at the opening ceremony of the 2013 Harbin International Ice and Snow Festival in Harbin. — AFP Photo

Visitors looking at a huge snow sculpture in Ice and Snow World at the opening ceremony of the 2013 Harbin International Ice and Snow Festival in Harbin. — AFP Photo

People visiting Ice and Snow World during the opening ceremony of the 2013 Harbin International Ice and Snow Festival in Harbin. — AFP Photo