Admire the best of byzantine and ottoman istanbul on this full day tour of this endlessly absorbing city traveling in a luxury minivan with a knowledgeable guide check out five top istanbul attractions that recall these two all powerful empires visit the extraordinary hagia sophia and beautiful blue mosque marvel at the treasures of the topkapi palace once the court of ottoman sultans and explore the atmospheric grand bazaar whose roots date to the 15th century with numbers limited to 12