The Three Gorges Dam in China is the world's largest hydroelectric dam, aimed at flood control, power generation, and tourism while costing $25 billion and causing significant controversy over human rights and environmental impacts. It has led to the displacement of up to 1.9 million people, loss of historical and archaeological sites, and worsening pollution in the Yangtze River. The dam's construction has also raised concerns about increased geological hazards, including earthquakes, as it is located on major fault lines.