The Imam Husayn Shrine is the mosque and burial site of Husayn ibn Ali, the third Imam of Shia Islam, in the city of Karbala, Iraq. It stands on the site of the Mausoleum of Husayn, who was a grandson of Muhammad, near the place where he embraced martyrdom during the Battle of Karbala in 680 CE The tomb of Husayn is one of the holiest sites in Shia Islam, outside of Mecca and Medina, and many make pilgrimages to the site. Every year, millions of pilgrims visit the city to observe Ashura, which marks the commemoration of Husayn's death for all Muslims.