Qastal al-Harami Mosque is located in the Qastal al-Harami quarter. It was built around a stream of water that flows inside of the main facade. The mosque was renovated by the Mamluk prince Bardabek in 1490. All that remains now of the original structure is the facade, the stream, turbeh with the tomb of Bardabek and the minaret.
Source:
Rihawi, Abdul Qader. 1979. Arabic Islamic Architecture in Syria. Damascus: Ministry of Culture and National Heritage. 184.