Millions of Muslim pilgrims are pelting stone walls representing the devil before a final trip back to Islam's holiest site the Kaaba on the closing day of the annual Hajj. Around 3 million pilgrims are casting pebbles at three walls in the desert valley of Mina in a symbolic rejection of Satan's temptation for a third consecutive day.<br/><br/>The faithful will then head back to Mecca for a final journey known as the Farewell Circulation around the Kaaba.<br/>