Principle private chamber of the Sultan in the Harem Designed by the architect Sinan in the 16th century.  The large square room with its high-domed ceiling  features a copper canopied fireplace, a baldachin and the fountain pictured below.  The walls are decorated with beautiful tiles.  An inscription in jali-thuluth Arabic script pm blue and white tile, runs around the room.   The windows are double glazed against  the Istanbul winter.