The Great Mosque of Samarra is a 9th century mosque located in Samarra, Iraq. The mosque was commissioned in 848 and completed in 851 by the Abbasid caliph Al-Mutawakkil who reigned from 847 until 861.
The Great Mosque of Samarra was at one time the largest mosque in the world; its minaret, the Malwiya Tower, is a vast spiralling cone 52 meters high and 33 meters wide with a spiral ramp.
The mosque had 17 aisles, and its walls were panelled with mosaics of dark blue glass. It was part of an extension of Samarra eastwards.