Image: US President Obama visits the Blue Mosque

epa01690661 US Presiden Barack Obama (2nd R) and Turkish Prime Minister Recep Tayyip Erdogan (L) take off their shoes as they visit the Blue Mosque with Muslim clerics Emrullah Hatipoglu (R) and Mustafa Cagrici (L) in Istanbul, Turkey, 07 April 2009. US President Barack Obama has ended his European tour by saying he is committed to opening a "new chapter in American engagement" with the Muslim world. EPA/KAYHAN OZER