http://AmateurTraveler.com/2007/06/2...to-wall-sites/

Visit Istanbul, Turkey with the Amateur Traveler: The ancient walls of
Constantinople built by Theodosius II in 413 A.D. Also see the
fortress of seven towers at the Southern end of the wall (and a view
of the amazing number of ships coming and going to Istanbul). Also see
video of the mosque of Suliman the Magnificent.