Photo taken on May 4, 2018 show Karl Marx themed souvenirs displayed in Trier, Germany. The 200th anniversary of Karl Marx's birth falls on May 5, 2018. (Xinhua/Shan Yuqi)
Photo taken on May 4, 2018 show Karl Marx themed souvenirs displayed in Trier, Germany. The 200th anniversary of Karl Marx's birth falls on May 5, 2018. (Xinhua/Shan Yuqi)