Sha'ar Hashamayim Synagogue exterior. The one synagogue that is open to the general public is the Ben Ezra synagogue in Coptic Christian Cairo. Unfortunately it was closed for restoration. According to local folklore, it is located on the site where baby Moses was found. It housed the Cairo Genizah, an attic where over 300,000 documents including original letters from Moses Maimonides were found.The Synagogue of Ben Ezra was originally a Christian church that the Christians sold to the Jews, in 882 A.D to be able to pay the annual taxes imposed by the Muslim rulers at that time. As a consequence, Abraham Ben Ezra, who came from Jerusalem during Ahmed Ibn Tulun’s reign, bought the church for 20,000 dinars.