This Istanbul Aquaduct was built on an old Roman aquaduct foundation by Mimar Sinan between 1554-1562. It's an aquaduct that measures 35 m. in heigth and 408 m. in length. Its single storey part bears 12 fountainheads, whereas the three storey main aquaduct has 4 in the first storey, 10 in the second and 21 in the third one. It's known as the Broken Aquaduct because of the 90 degrees turn of direction in its entrance.