Tour Istanbul’s historic Sultanahmet district, starting with the Hippodrome, the Byzantine center for chariot races and ceremonies, featuring the Egyptian Obelisk, Serpentine Column, Column of Constantine, and Kaiser Wilhelm II Fountain. Explore the Basilica Cistern, a 6th-century “Sunken Palace,” then visit the Blue Mosque with its iconic Iznik tiles. Stop for photos at Hagia Sophia, and tour Topkapi Palace, the former residence and administrative heart of the Ottoman Empire.