Private Tour: Istanbul in One Day Sightseeing Tour including Blue Mosque, Hagia Sophia and Topkapi Palace. Experience the finest attractions in Istanbul’s Sultanahmet district during this private, guided day tour of the Blue Mosque, Hagia Sophia and Topkapi Palace. Marvel at these famous monuments alongside your expert guide who will give you individual attention on this private voyage. Book this Tour and Save 20%: Private Tour: Istanbul in One Day Sightseeing Tour including Blue Mosque, Hagia Sophia and Topkapi Palace.