The spacious and open area in Sultanahmet is home to the Hippodrome, the space in which the Byzantines held their chariot races and other sports events. Today the remaining monuments that graced the square in those years are the Obelisk of Theodosius, the Serpentine Column, and the Column of Constantine. The 18th century wooden houses in the environs of the Hippodrome -especially those on Sogukcesme (cold well) Street are definitely worth seeing. Now restored, one of these homes is being currently used as a library while the others function as small hotels. The Fountain of Sultan Ahmet HI is located in front of the entrance gate to the Topkapi Palace.

Built in 1828 by Sultan Mahmut II, the Beyazit Tower was built as a fire look-out tower. The Bozdogan-Valens Aqueduct was originally built in 368 by the Byzantines and then augmented in later years by the Ottomans; both empires used these aqueducts as a means of transporting water into the city. Also known as Leander's Tower, the Maiden's Tower is one of the most charming symbols of Istanbul. The subject of numerous legends and myths, the tower was first built in the 12th century. Today's tower dates to the 18th century. The once impregnable city walls are seven kilometers long, stretching from the Marmara Sea to the Golden Horn. These 5th century walls were built by the Byzantine Emperor Theodosius II. The walls and their environs are registered on the United Nation's cultural heritage list.

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