Boaz Pash, chief rabbi of Krakow, explains symbols of polychrom of reconstructed roof of a 18th century wooden synagogue that once stood in the town of Gwozdziec and which will be a key exhibit in the Museum of the History of Polish Jews, which is due to open in 2014, in Warsaw on March 12, 2013. The original synagogue was destroyed by the Nazis during World War II. AFP PHOTO/JANEK SKARZYNSKI