Masjid al-Haram 1

Al-Masjid Al-Haram  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 obligatory daily prayers. 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,

 including 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 worshippers

 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 canworship at Al-Masjid Al-Haram together.