A boat passes by the "Underwater Great Wall" in Kuancheng county of Hebei province on Aug 13. In 1975, the government built the Panjiakou Reservoir in Kuancheng county, therefore water inundated a section of the Great Wall there which is 500 years old. Because of drought and an increase in the use of water, the water level at the Panjiakou Reservoir fell more than 10 meters and part of the "Underwater Great Wall" emerged. However since July, the heavy rain has again raised the water level to the highest it has been in ten years and the Great Wall again is submerged. Uniquely, it is the only place where the Great Wall dips underwater. [Photo/Xinhua]