Except for his boss Heinrich Himmler, only Reinhard Heydrich — head of the SS security service and the Gestapo — was so instrumental in the planning and execution of the mass murder of six million European Jews, according to a historian Robert Gerwarth. ...

Scientists using ground-probing electronics may have discovered the missing mass graves at the site of Treblinka, one of the Nazis' most notorious death camps. No actual bodies were found and the graves were not excavated, in keeping with Jewish law,...