The Illinois Holocaust Museum and Education Center is using holograms to help visitors learn about the experiences of people during the Holocaust. Ron Gould Studios/Courtesy of the Illinois Holocaust Museum hide caption
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Pieces of cloth that Mansour Omari and other inmates at a notorious Syrian prison used to document the names of the "disappeared" held with them. They made ink out of blood from their bleeding gums and rust from the prison bars. Dylan Collins/Courtesy of the U.S. Holocaust Memorial Museum hide caption
A member of the federal police holds an hourglass with Nazi markings on Friday at the Interpol headquarters in Buenos Aires, Argentina. Natacha Pisarenko/AP hide caption
The Pokémon Go mobile game is the top-grossing app for Android and iPhone. Today, the U.S. Holocaust Museum and Arlington National Cemetery asked people to refrain from using the game while visiting the somber sites. Richard Vogel/AP hide caption
In the Hall of Remembrance at the U.S. Holocaust Memorial Museum, visitors can light candles in memory of the 6 million Jews killed by the Nazis and their collaborators during World War II. Nicholas Kamm /AFP/Getty Images hide caption
