Workers dig trenches for a horizontal move of the main exhibition hall of the Yellow River Museum in Zhengzhou, capital of central China's Henan Province, July 19, 2011. Two wings of the museum had already been demolished, to be rebuilt later. For the construction of subway line 1 and 2, local authorities allowed a move of the world's first museum devoted to water conservancy. [CNS Photo/ Wang Zhongju]
