Photo taken on May 17, 2019 shows enlarged South African citizen ID cards in different colors from the apartheid era in the Apartheid Museum in Johannesburg, South Africa. The Apartheid Museum opens a window into South Africa's past struggle with colonial domination, injustices and racial segregation while spotlighting the dawn of an independence era marked with racial integration and just rule. May 18 marks the International Museum Day. (Xinhua/Chen Cheng)