A visitor visits the exhibition "Karl Marx 1818-1883. Life. Work. Time." in the Rheinisches Landesmuseum Trier in Trier, Germany, on May 3, 2018. State exhibition "Karl Marx 1818-1883. Life. Work. Time." will last from May 5 to Oct. 21 in the Rheinisches Landesmuseum Trier and City Museum Simeonstift Trier. (Xinhua/Shan Yuqi)