Ipek Bodrum (Turkish “Silk Cellar”) is a cistern situated in the northwestern part of Constantinople, a short distance from the Cistern of Aetius. It is possible that Ipek Bodrum was part of a monastery that also included Kasım Ağa Mosque and Odalar Mosque. 
Its construction date is uncertain, but perhaps dates to the 12th century. It was used by Armenian spinners in the 19th century, and referred as Ipek Bodrum. It was damaged in a fire in 1919, and later was almost completely filled with rubbish and debris. It is currently buried under a park. 
It had a rectangular plan measuring 17 x 29 meters and had dome-shaped vaults. It had 4 colonnades, each consisting of seven columns, many of which were richly decorated. It is unclear if it was originally connected to the nearby open cistern of Aetius.