⚡ China’s Three Gorges Dam is the largest hydroelectric project in the world — 1.5 miles long, 600 feet high, and holding back over 10 trillion gallons of water. Built with a billion pounds of steel and enough concrete to raise a city, it generates 100 billion kWh annually, enough to power NYC and Chicago for a year. It even shifted Earth’s rotation by microseconds. Would you visit this man-made giant? #Engineering #MegaProjects #UndefinedIdeas | Undefined Ideas