Masjid al-Haram is the largest mosque on earth. Expanding over an area in excess of 4,000,000 square metres within the city of Mecca, Masjid al-Haram was built in 638 AD and has the capacity to be able to accommodate up to 4,000,000 people.
☪ The Kaaba or Ka'aba is a cuboid building at the center of Islam's most sacred mosque, Al-Masjid al-Haram, in Mecca, Saudi Arabia. It is the most sacred site in Islam. Wherever they are in the world, Muslims are expected to face the Kaaba – i.e. when outside Mecca, to face toward Mecca – when performing salat (prayer). From any point in the world, the direction facing the Kaaba is called the qibla.