China's 816 Nuclear Military Plant, a decommissioned Cold War-era plutonium and weapons processing facility, has recently reopened for the public to tour.
The nuclear plant is located deep into the Chongqing mountains and features one of the world's largest man-made caves.
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Construction of the plant began in 1967 with government figures estimating that in excess of 60,000 Chinese soldiers worked on it for 17 years before it the plant was put out of commission in 1984.