A ramp tower of the Great Palace of Constantinople

A little-known fragment of the Great Palace of Constantinople — the vast imperial complex that served as the center of Byzantine power from the 4th to 12th century. This ramp tower is tentatively identified as part of the Corridor of the Lord, a passageway linking terrace levels across the palace grounds; some visitors suggest it may be the Spiral Staircase of St. Christina, connecting platforms roughly 21 and 26 meters above sea level. Today the structure sits wedged between the Sultanahmet streetscape and modern buildings, glimpsed from side streets near the Palatium Café or the garden of the Başdoğan Carpet Palace. Concrete reinforcement beams and construction fencing obscure the original masonry — a reminder of how much of ancient Constantinople remains unexcavated beneath modern Istanbul.