The last of the classical Ottoman Mosques, the Yeni Cami, or Yeni Valide Sultan Cami (the Queen Mother’s New Mosque, to give its proper name), was completed between 1660 and 1665 after a series of false starts seven decades earlier. At the time it still stood inside the old Byzantine sea walls. It dominates the entrance to the Golden Horn whether you arrive by sea or from the European quarters across the Galata Bridge. A mosque of many domes, it is contemporary with St Paul’s in London, and it would have a strong influence on the English Baroque. The patron was the formidable queen mother Turhan Sultan, mother of Mehmed IV, better known as Mehmed the Hunter. Worth stepping inside.