Al-Masjid Al-Haram (Arabic: المسجد الحرام, The Sacred Mosque or The Grand Mosque) is in the city of Mecca, Saudi Arabia. It is the largest mosque in the world and surrounds one of Islam's holiest places, the Kaaba. Muslims face in the direction of the Kaaba while performing formal worship, salat. One of the Five Pillars of Islam requires every Muslim to perform the Hajj pilgrimage at least once in his or her lifetime if able to do so, includes circumambulation of the Kaaba.
The current structure covers an area of 356,800 square metres (88.2 acres) including the outdoor and indoor praying spaces and can accommodate up to two million worshipers during the Hajj period, one of the largest annual gatherings of people in the world. Unlike many other mosques which are segregated, men and women can worship at Al-Masjid Al-Haram together.