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Hwacheon, South Korea
Before 1900, Hwacheon was extremely sparsely populated, with only a few small villages alongside major rivers, due to its rugged terrain and harsh winters. Hwacheon Dam was completed in 1944 and the electricity it generated proved to be a boon. However, it was also source of conflict during the Korean War due to its strategic value as both a power plant and potential weapon (by intentionally flooding downstream areas). It ended up well inside allied territory with the establishment of the DMZ to the north in 1953.
"Believe me, right now is the time to resist our predisposition to impulsive behavior. We need a plan."
Jenna Coleman at the Doctor Who World Tour - Season 8 Premiere in Cardiff (Aug 7, 2014)