Palestinians holding replicas of house keys, representing the front door keys of abandoned homes, as they attends the 65th Nakba day or "Day of Catastrophe" rally in Gaza City, on May 15, 2013. Palestinians and Arab Israelis are marking what to them is the Nakba -- Arabic for "catastrophe" -- of the creation of the Jewish state and exodus of 760,000 of them from their homes in 1948.