See the landmark sights of Istanbul on a half-day tour by air-conditioned vehicle. You will be picked up from your hotel, port, or airport, and transferred in comfort to the historic city center. Discover the Ottoman and Byzantine history of the city at sites such as the Hagia Sophia, one of the marvels of world architecture. Constructed as an Orthodox basilica in the 6th century by Emperor Justinian, its 4 minarets were added when it was converted to a mosque. Marvel at the Blue Mosque, facing the Hagia Sophia. Famous for its blue Iznik tiles and 6 minarets, it is the icon of Istanbul and the culmination of 2 centuries of Ottoman development. Move on to the Hippodrome, center of chariot races, athletic events, and political activities of the city when it was known as Constantinople. Next, admire the imperial residence of the Ottoman sultans at Topkapi Palace. See the exquisite jewels in the treasury, and a priceless collection of miniatures and medieval manuscripts