I recent visited a large prison in South Korea that was used during the Japanese colonization period (1910-1945). There are basement torture chambers, activists were killed there, etc. A few years ago it was turned into a history hall, highlighting the good and bad that took place. It was strange seeing so many children just running around playing in the fields between the building. Search the hashtag #seodaemunprison on Instagram and see the first photo that comes up. You'll think it's a playground or something.