It's the bridge over the Drina River, the subject of a novel by Ivo Andrić, and it talks about how, in that very troubled part of Europe and the Balkans, over time there's been enormous building of walls.
它在Drina河上， 是作家Ivo Andric的一个小说的主题， 这部小说讲述了 如何在欧洲和巴尔干地区最动荡的部分 大量的墙被筑起。