Mass grave
During World War II, German soldiers who died when Nazi Germany invaded the Soviet Union were buried in mass graves in Eastern Europe.  In 2013, the German War Graves Commission moved 70,000 soldiers from mass graves to a cemetery in Russia.  This was the 82nd cemetery the Commission had built to re-bury soldiers buried in mass graves.  All together, the 82 cemeteries hold more than 800,000 German soldiers.  The Commission says there are at least 250,000 more German soldiers buried in mass graves throughout Eastern Europe.