“Japan has won UNESCO World Cultural Heritage Status for 23 industrial sites after conceding to South Korea’s demand that the registration make clear that some of the locations used forced laborers from the Korean Peninsula.”
The above sentence begins an article published at the following address: http://www.japantimes.co.jp/news/2015/07/06/national/history/unesco-decides-to-add-meiji-industrial-sites-to-world-heritage-list/
The picture you see is of “the Manda pit of the former Miike coal mine in Arao, Kumamoto Prefecture.” Miike’s coal mining facility in Arao was also a site at which forced labor occurred. To see a Japanese page about a monument for Chinese laborers who died working in the mines go to http://www.miike-coalmine.org/ireihi/china.html
And here’s the address of an article written in Japanese about Korean laborers: http://www16.ocn.ne.jp/~pacohama/kyosei/mituimike.html
http://ajw.asahi.com/article/behind_news/politics/AJ201505080074