Jeju Peace Museum
Good Man and I ended up going to a fairly new museum/peace center.
During the Japanese occupation, the Japanese made Korean dig tunnels to use to defend the area from Americans. A man who had to help dig the tunnels started this museum a few years ago. Interestingly, the gov't gives the center NO financial support.
Inside the tunnels they had statues to give you an idea of what it was like to work and be inside of the tunnels.