An adviser to Palestinian Authority president Mahmoud Abbas visited Auschwitz on Friday.Ziad al-Bandak, a Christian who advises Abbas on Christian affairs, visited prisoner blocs, gas chambers and a crematorium in the Auschwitz-Birkenau complex in Poland, The Associated Press reported.Al-Bandak, who came at the invitation of a private Polish foundation promoting tolerance, laid flowers at the Death Wall in Auschwitz, where Polish resistance fighters were summarily executed and placed a light at the monument to the camp's victims.