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. Description The boundary wall of the shrine surrounds wooden gates covered with glass decorations. The gates open into a courtyard separated into smaller rooms or precincts with many "Iwans" along the walls. The grave of Husayn is enclosed within a metal-mesh like structure, found directly beneath the golden dome. On 5 March 2013 the process of replacing the zarih (metal mesh like structure) over the tomb of Husayn was completed and the new zarih inaugurated. Al Abbas Mosque is located nearby. Plans to replace the shrine's historic dome with a modern steel framed one, have been met with controversy especially by historic preservationists as it would severely distort the shrine's historic integrity and character. The first dome is high and completely covered with gold. At the bottom, it is surrounded with twelve windows, each of which is about away from the other, from the inside, and from the outside. The shrine has an area of by with ten gates, and about 65 decorated rooms used for studying. Burials The grave of Husayn ibn Ali is found in the middle of the precinct, it is called the ("garden") and it has several doors. The most famous one is called or . On the right hand side of the entrance is the tomb of Habīb ibn Madhahir al-Asadī (حبیب ابن مظاہر الاسدی), a friend and companion of Husayn since their childhood and a casualty of the Battle of Karbala. Within the shrine of Husayn can also be found a grave of all the 72 martyrs of Karbalā’. They were buried in a mass grave which was then covered with soil to the ground level. This mass grave is at the foot of Husayn's grave. As well, beside Husayn's grave are the graves of his two sons: ‘Alī al-Akbar