Lake Chagan burst into existence during the Cold War when the Soviet Union detonated numerous nuclear explosions in northeastern Kazakhstan to find alternative uses for its bombs. Though it was an initiative of the Nuclear Explosions for the National Economy program and was realized in 1965, this man-made water source was hardly well-known. Newly uncovered footage shows the Russians creating this lake in a great plume of mushroom-shaped smoke. While Lake Chagan is still largely radioactive and thusly impossible to drink from, it's breathtaking to behold.
Check out how the United States created fake towns to test nuclear weapons and learn from the eye-opening photos of Fukushima after its nuclear disaster. Also, read some atomic bomb survivor stories here.