Astronauts on the International Space Station for the first time captured this clear image of China's Three Gorges Dam and its swelling reservoir last month. The dam, which was completed in 2006 and is the largest in the world, was billed by China's leadership as a way to control flooding on Yangtze River and provide hydroelectric power to the country. Since its 1992 proposal, the massive structure has been plagued by controversy: The $24-billion project forced more than a million people to relocate; destroyed towns, villages and historical sites; and led to landslides, drops in biodiversity, water pollution, an increase in waterborne diseases and, some argue, even earthquakes. The image shows part of the reservoir, which snakes through the valley for more than 375 miles (600 kilometers) behind the dam [lower right].