 Walled Obelisk

The Walled Obelisk or Masonry Obelisk () is a Roman monument in the form of an obelisk in the former Hippodrome of Constantinople, now Sultanahmet Square in Istanbul, Turkey.It is situated west of the Sultan Ahmed Mosque, at the southern end of the ancient chariot-racing track of Constantinople's central barrier, beside the Obelisk of Theodosius and the Serpentine Column.