The Sanctuary of Imam 'Ali, also known as the Mosque of 'Ali, located in Najaf, Iraq, is a mosque which many Muslims believe contains the tomb of Caliph and Imam 'Alī ibn Abī Tālib, it is holy to both Sunni and Shia Islam. He was a cousin of the Islamic prophet Muhammad and later became his son-in-law as well. The Shias consider Ali as their first Imam, and the Sunnis regard him as their fourth Sunni Rashidun Caliph. Each year millions of pilgrims visit the Shrine and pay tribute to Caliph Ali ibn Abi Talib, and the Ottoman Sultan Abdülaziz also offered gifts to the sactuary of the fourth Caliph.
According to Shi'ite belief, buried next to Ali within this mosque are the remains of Adam and Nuh.