After breakfast, start your day with some sightseeing in the old city, formerly Constantinople, and the seat of the Eastern Roman Empire. Here you can visit the Hagia Sophia basilica, built during the reign of Emperor Theodosius and burned down in the fire of Nika Revolt in 532 A.D. during the reign of Justinian. Continue on to the Sultan Ahmet Mosque, built between 1609 and 1616 by the architect Mehmet under the orders of Sultan Ahmet I, better known as the Blue Mosque. Follow on to the ancient Hippodrome, the scene of many chariot races and the center of Byzantine civic life during the Roman era. Of the ornaments which once decorated it, only three remain The Obelisk of Theodosius, the bronze Serpentine Column, and the Column of Constantine. Before lunch pay a visit to Istanbul’s bustling Grand Bazaar, exploring a labyrinth of streets and passages housing more than 4,000 shops. After lunch, proceed to Topkapi Palace, the maze of opulent buildings that was the center of the Ottoman Empire between the 15th and 19th centuries. Finally, we will visit Basilica Underground Cistern from the 5th Century which was used as water storage during the Byzantium period. End of the tour. Return to the hotel overnight in Istanbul.