Pope Francis, left, is welcomed by Istanbul Mufti Rahmi Yaran upon their arrival to the Blue Mosque in Istanbul, Turkey, Saturday, Nov. 29, 2014. Pope Francis visits two of Turkey's most iconic sites and shifts gears toward more religious affairs as he arrives in Istanbul for the second leg of his three-day visit to the Muslim nation. The Vatican says Francis will tour Istanbul's Sultan Ahmet mosque on Saturday and pause for a moment of "reflection." (AP Photo/Thanassis Stavrakis)